I think it's ok. It might be useful. ..

I'll post it for you to see ....

Several reasons for slow network speed:

First, the network itself

The target website you want to connect to is located on a server with insufficient bandwidth or heavy load. The solution is simple, please change the time or change the target website.

Second, the network cable problem caused the network speed to slow down.

As we know, twisted pair is composed of four pairs of wires tightly twisted together according to strict regulations to reduce the influence of crosstalk and background noise. Meanwhile, in T568A standard and T568B standard, only four wires of twisted pair 1 2 and 3,6 are used, in which 1 2 is used for transmission, 3,6 is used for reception, 1 2 must come from one winding pair, and 3,6 must come from one winding pair. In this way, crosstalk can be avoided to the maximum extent and data transmission can be guaranteed. In practice, I found that the network cable not made according to the correct standards (T586A, T586B) has great hidden dangers. The performance is as follows: in one case, the network speed is very slow when it is first used; In another case, the network speed was normal at first, but after a while, the network speed slowed down. The latter situation is very obvious on desktop computers, but it is normal to check the network speed with laptop computers. After years of practice, I found that the slow network speed caused by the network cable not made according to the correct standard is also related to the quality of the network card. Generally, the network card performance of desktop computers is not as good as that of notebook computers. Therefore, when using the switching method to troubleshoot, using a laptop to detect the normal network speed cannot rule out the problem that the network cable is not made according to the standard. We now require all network cables to be suppressed according to T586A and T586B standards, and notebook computers cannot be used instead of desktop computers for fault detection.

Third, there is a loop in the network, which causes the network speed to slow down.

When the number of nodes involved in the network is small and the structure is not very complicated, this phenomenon rarely occurs. However, in some complex networks, there are often redundant spare lines, which will form a loop if they are inadvertently connected. For example, the network cable is connected from the network center to the computer room 1, and then from the computer room 1 to the computer room 2. At the same time, there is a backup line directly connected to the computer room from the network center. If these lines are connected at the same time, it will form a loop, constantly sending and checking packets, thus affecting the overall network speed. This situation is hard to find. In order to avoid this situation, we are required to develop good habits when laying network cables: the network cables should be clearly marked, and records should be made where there are spare cables. When this kind of fault is suspected, the method of partition step by step is generally adopted.

Fourth, the broadcast storm caused by the hardware failure of network equipment leads to the slow network speed.

As the main means of discovering unknown devices, broadcasting plays a very important role in the network. However, with the increase of the number of computers in the network, the number of broadcast packets will increase dramatically. When the number of broadcast packets reaches 30%, the transmission efficiency of the network will decrease obviously. When the network card or network equipment is damaged, broadcast packets will be sent continuously, which will lead to a broadcast storm and paralyze network communication. Therefore, when the hardware of the network equipment fails, the network speed will also slow down. When this kind of fault is suspected, the hub or switch can be replaced by replacement method to eliminate the fault of hub equipment. If these devices are not faulty, after turning off the power of the hub or switch, use the "Ping" command under DOS to test the computers involved one by one, find the computers with faulty network cards, and replace them with new network cards to restore the normal network speed. Network cards, hubs and switches are the most prone to failure and slow down the network.

Five, a port in the network has formed a bottleneck, resulting in slower network speed.

In fact, router WAN port and LAN port, switch port, hub port and server network card may all become network bottlenecks. When the network speed is slow, we can use network management software to check the data flow of routers, switches and server ports during the peak period of network use; You can also use the Netstat command to count the data traffic of each port. On this basis, the location of network data circulation bottleneck is determined, and its bandwidth is managed to increase. There are many specific methods, such as changing the server network card to 100M or 1000M, installing multiple network cards, dividing multiple VLAN, changing the router configuration to increase bandwidth and so on. , which can effectively alleviate the network bottleneck and maximize the data transmission speed.

Sixth, the influence of the worm virus causes the network speed to slow down.

Worms spread by mail have a more and more serious impact on the network speed, which is extremely harmful. This virus causes infected users to keep sending emails as soon as they get online. The virus randomly selects documents from the user's personal computer and attaches them to random addresses in the user's computer address book to send emails. Hundreds of such junk mails were sent out in line, and some of them were returned in batches and piled up on the server. As a result, individual backbone Internet appears obvious congestion, and the network speed obviously slows down, which makes the local area network almost paralyzed. So be sure to upgrade antivirus software in time; Computers should also upgrade and install system patches in time, uninstall unnecessary services, and close unnecessary ports to improve the security and reliability of the system.

Seven, excessive use of firewalls

Excessive use of firewalls will also slow down the network speed. Needless to say, uninstall unnecessary firewalls and keep only one powerful enough.

Eight. Insufficient system resources

You may have too many applications loaded to run in the background. Please load the software reasonably or delete useless programs and files to release resources, so as to improve the network speed.

Optimize your broadband and double the speed of surfing the Internet.

Before optimization, you can use "ping" to understand the relevant network parameters, or you can use relevant software to detect the network speed, such as "TCP optimizer".

Optimize the registry (it is best to back it up in advance just in case): the modifiable key values are as follows: MaxMT: modify the maximum transmission unit; DefaultRcvWindow and DefaultTTL: set the size value of the transmission unit buffer and the lifetime of TCP/IP packets; Set DNS query priority: improve web browsing speed; Improve the RAM used by TCP/IP: increase the buffer used by TCP/IP and improve the data rate.

Release the reserved bandwidth: log in as an administrator and run the command "gpedit.msc" to enter the Group Policy window. Click Computer Settings, Management Module, Network and QoS Packet Scheduler in turn, then select Restrict Reserved Bandwidth on the right, and right-click Properties to open its property window, and modify the value corresponding to Restrict Bandwidth to 0 to release the reserved bandwidth.

Optimization software: Take TCP optimizer as an example. First, click "MaxMTU" to view the relevant parameters of users using the network. However, when we enter the address of the website, it is better to choose the address of the local ISP instead of using its default URL. So is "delayed PING". In the "Settings" tab, we select the type of Internet modem we use, then select "Best Settings" at the bottom of the interface above, and then click the "Apply Changes" button to restart the computer. Ten minutes of computer acceleration

In fact, there are many ways to improve the speed of computers, but there are always some dangers, which is why many people don't touch their hands. Here I want to introduce you to a quick and safe method. The method described below is only a reasonable setting of the machine. You can rest assured that the machine does not need any physical modification and does not need to use complicated third-party optimization software. There are so many settings on the computer. Just after checking the memory, press the "DEL" key, and the screen will flash into the heart of the computer: the setting screen of "BIOS". Don't underestimate him, he completely controls your computer, let's take this "heart" off together! On the homepage of BIOS settings, we enter the "Advanced BIOS Function" option, move the cursor to the "First Boot Device" option, and press "PageUP" and "PageDOWN" to select. The default value is "Floppy", which means that the system will first read the startup information from the floppy drive when it is turned on, which is very unsuitable for our normal machine. Because now is the era of Windows9x, you don't need a startup disk at ordinary times, so it is futile to read the floppy disk every time you turn it on, and it will lengthen the startup time of the machine and shorten the life of the floppy disk. So we should choose "HDD-0" to boot directly from the hard disk, which will be faster. Go back to the home page and select Advanced Chipset Features. The setting in this option has a great influence on the acceleration of the machine. Please pay more attention. Change "Bank 0/ 1 DRAM timing" from "8ns/ 10ns" to "fast" or "Turbo". "Turbine" is faster than "fast" but unstable. It is recommended to choose "fast". You can choose "Turbo" if the memory quality is good, and change it back to "Fast" if it is unstable. Looking down, you will find the option of SDRAM CAS delay. The best choice is "2" with good memory quality, but "3" is recommended based on stability. In the future, it will always be a "DRAM clock", allowing you to run memory at a high clock frequency. Change 66 to 100 or 100 to 133. Now most of the memory is PC 133, so you can change it with confidence. It's all the same sentence, "instability can be changed." (Note: Some versions use +33, but the meaning is the same. ) Newer motherboards support AGP4X. If your graphics card also supports AGP4X, activate it in "AGP4X mode", which can give full play to the capabilities of your graphics card. If you support both, remember not to waste it! (Note: the activation of 4X is not a single problem, but a prerequisite for opening 4X, which we will analyze in detail later. ) The next item is "AGP aperture size", that is, the system call memory of video memory. With the gradual popularization of large memory graphics cards, this option has no great significance. Tested as 16M, 32M and 64M. 128M has almost no difference. Even if 16M is compared with 128M, the difference is less than 2%. So don't let too much memory wait for those useless tasks, just release them. Choose 16M or 32M is enough. In fact, there are many settings in the BIOS, but the effect is not obvious. Let's put them down first, declare that the "heart-picking operation" has ended successfully, and select "Save &; Exit setup "and press" y "to restart. After the coring operation, the machine successfully landed on Windows. At this time, do you already feel that the startup of the machine and the running of the program are much faster than before, but this still can't satisfy us. Because Windows doesn't seem to be obedient, and the settings of Windows itself are not optimal, you should conquer it yourself. When I first entered Windows, I saw the machine blindly open the resident program (note: the resident program refers to the small icon next to the time display in the toolbar of the start menu after booting, indicating that all programs will open in the background as soon as you boot). In this way, the software that is not used much at ordinary times is opened every time with the start of the computer, which greatly occupies the system resources and reduces the performance of the computer. At this time, we only need to press "Start/Run/Type" msconfig "to confirm/enter the program, and then press" Start "to see all the programs started by the system here. Just empty the box in front of the programs that we don't want to start. It is suggested to remove all the unused ones, such as "Jieba, WINAMP, ICQ, OICQ" and so on. For the sake of safety, please don't remove the firewall. After the restart, you will find a qualitative leap, and you will never see the tragic situation of hard disk lights flashing after the restart. Really happy, haha! After fully entering Windows, we can make the following settings: First, start DMA mode to improve the speed of hard disk. The maximum transmission rate of the hard disk using UDMA/33,66, 100 technology is 33MB/s, 66MB/s,1000 MB/s, which is an IDE hard disk (here, it refers to PIO MODE4 mode, and its transmission rate is 6544). But in the default settings of Windows, DMA is disabled, so we must turn it on. Enable DMA: Open the control panel/system/device manager window, expand the disk drive branch, double-click the UDMA hard disk icon, enter the properties/settings/options, check the DMA item, and then press OK to close all dialog boxes and restart the computer. Second, increase the cache to improve the performance of the optical drive. First, select the "My Computer" icon, click the right mouse button to open the "System Properties/Performance/File System/CD" window, then drag the "Additional Cache Size" cursor to the maximum (rightmost), set the "Additional Access Method" to "Four times or higher", and then click OK. Third, tidy up the hard disk. After long-term use, the files in the hard disk will form fragments. If you don't defragment this system, the performance of the system will be reduced. Finishing method: In Start/Accessories/System Tools, open the defragmenter, which can improve the performance of the system. (Note: This work will take a long time. Right-click My Computer, open the System Properties/Device Manager, expand the Modem branch, then double-click the icon of the modem you are using to pop up the Properties dialog box, select the Modem item, and set the Fastest Speed to 1 15200. Switch to the connection item in the Properties dialog box, click the Advanced button, select the hardware in the Use Flow Control checkbox, and then click the OK button to exit the Advanced dialog box. Finally, click the "Port Settings" button, select the "Use FIFO Buffer" check box, drag the "Receive Buffer" and "Send Buffer" cursors to the "high" end, and click "OK". 5. Use 32-bit file allocation table (FAT32) If you are a user of WIN98, you'd better use FAT32(32-bit partition) for the best performance. Because FAT32 is faster and more space-saving than FAT 16, its compatibility is certain. Usage: Open the Explorer, click the icon of each drive, select the file drop-down menu, and then click Properties. If the file system is in FAT 16 mode, click Disk Cleaner/Other Options/Convert to change the FAT 16 mode to FAT32. Sixth, reduce the workload of the graphics card If you find that the computer screen refresh rate is slow or there is other video interference, it may be caused by the workload of the graphics card. In fact, if you are not too obsessed with using 32-bit color for picture and game quality, it is recommended to use 16-bit color, because it can reduce the workload of graphics cards and has little effect. Then there is the adjustment of resolution, because too high resolution will also increase the workload of the graphics card, which is not good for the eyes. Setting method: In the screen window, right-click the "Properties" option to open the "Settings" dialog box, where you can adjust the resolution and the number of color bits until you are satisfied. If your graphics card is not broken, I suggest you use the graphic "All Hardware Acceleration": right-click "My Computer" to open the "Properties/Performance/Graphics" dialog box, and drag the "Hardware Acceleration" cursor to "All". Setting up a network server Setting up a computer as a "network server" can greatly improve the performance of the computer. Setting method: Right-click my computer to open the Properties/Performance/File System dialog box, select the main purpose of this computer, change "Desktop" in the drop-down menu to "Network Server", drag the "Preview Optimization" cursor to "All", and then click "OK" to restart the computer. After the above "coring action" and "conquering action", the performance of the computer has been greatly improved. However, all this is not complicated, and it doesn't even take ten minutes. It is worth a lot of novices to give full play to their abilities and give it a try. Well, enjoy the accelerated results slowly.