First, the network itself

The server where you want to connect to the target website has insufficient bandwidth or is overloaded. The solution is simple, please go to another time or change the target website.

Second, the network cable problem causes the network speed to slow down

As we know, twisted pair is tightly twisted by four pairs of wires 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 are used, namely, 1 and 2 are used for transmission, 3 and 6 are used for reception, and 1 and 2 must come from a winding pair, and 3 and 6 must come from a winding pair. Only in this way can we avoid crosstalk to the maximum extent and ensure data transmission. In practice, I found that there are great hidden dangers in the network cables that are not made according to the correct standards (T586A, T586B). 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 is normal at first, but after a period of time, the network speed slows down. The latter situation is very obvious on the desktop computer, but the network speed is normal when checked with the laptop computer. After many years of practice, I found that the slow network speed caused by the network cable that is not made according to the correct standard is also related to the quality of the network card. Generally, the performance of the network card of desktop computer is not as good as that of notebook computer. Therefore, when troubleshooting by switching method, using notebook computer to detect the normal network speed can not rule out the problem that the network cable is not made according to the standard. We now require that all network cables be suppressed according to T586A and T586B standards, and laptop computers cannot be used to replace desktop computers in fault detection.

Third, there are loops in the network, which causes the network speed to slow down

When the number of nodes involved in the network is not large and the structure is not very complicated, this phenomenon rarely happens. 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, a loop will be formed, and data packets will be sent and checked continuously, thus affecting the overall network speed. This situation is difficult to find. In order to avoid this situation, we are required to develop good habits when laying network cables: the network cables are clearly labeled, and the places where there are spare lines should be recorded. When this kind of fault is suspected, the method of partition and step-by-step elimination is generally adopted.

fourth, the broadcast storm caused by the hardware failure of network equipment causes the network speed to slow down

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 3%, 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 broadcast storm and paralyze network communication. Therefore, when the hardware of the network equipment fails, it will also cause the network speed to slow down. When this kind of fault is suspected, the replacement method can be used to replace the hub or switch to eliminate the fault of the hub equipment. If these devices are not faulty, after the power of the hub or switch is turned off, the computers involved are tested one by one with the "Ping" command under DOS, and the computers with faulty network cards are found, and the network speed can be restored to normal by replacing them with new network cards. Network cards, hubs and switches are the devices that are most prone to failure and slow down the network speed.

5. A certain port in the network has formed a bottleneck, which leads to the slow network speed

In fact, router WAN ports and LAN ports, switch ports, hub ports and server network cards 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. Based on this, the location of network data circulation bottleneck is confirmed, and its bandwidth is managed to increase. There are many specific methods, such as changing the server network card to 1M or 1M, installing multiple network cards, dividing multiple VLAN, changing the router configuration to increase bandwidth, etc., which can effectively alleviate the network bottleneck and maximize the data transmission speed.

VI. The influence of worm virus causes the network speed to slow down

The worm virus distributed by E-mail has more and more serious influence 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 selects random documents from the user's personal computer and attaches them to the random address in the address book of the user's computer to send emails. Hundreds of such junk mails are sent out in line, and some are 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 nearly paralyzed. Therefore, we must upgrade the anti-virus software in time; Computers should also upgrade and install system patches in time, uninstall unnecessary services and close unnecessary ports at the same time to improve the security and reliability of the system.

VII. Excessive use of firewalls

Excessive use of firewalls can also slow down the network speed. Needless to say, there is no need to say how to deal with it. Only one powerful firewall is left after uninstalling unnecessary firewalls.

VIII. Insufficient system resources

You may have loaded too many applications running in the background. Please load the software reasonably or delete useless programs and files to free up resources to improve the network speed.

optimize your broadband to 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 transmission unit buffer and TCP/IP packet lifetime; Set DNS query priority: improve the browsing speed of web pages; Improve the RAM used by TCP/IP: Increase the buffer used by TCP/IP to 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, QoS Packet Scheduler in turn, then select Restrict Reserved Bandwidth on the right, right-click and select Properties to open its property window, and modify the value corresponding to Restrict Bandwidth to to release the reserved bandwidth.

Optimization software: Take TCP Optimizer as an example. First, click "MaxMTU" to check the relevant parameters of the network used by users. However, when we enter the address of the website, we'd better choose the address of the local ISP instead of using its default website address. The same is true for "Latency PING". In the "Settings" tab, we select the type of Internet modem we use, then select "Optimal Setting" at the bottom of the above interface, and then click the "Apply changes" button to restart the computer. Ten-minute computer speed-up

In fact, there are many ways to speed up the computer, but there are always some dangers, which is why many people don't touch their hands. Here I would like to introduce you to a quick and safe method. The method described below is only a reasonable setting of the machine, and you can rest assured that the machine does not need any physical modification and the use of complex third-party optimization software. There are so many settings on the computer. Just after the memory is checked, 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, so let's take off this "heart" together! On the homepage of BIOS settings, we enter the option of "Advanced BIOS Features", move the cursor to the option of "Frist Boot Devicd", and press "PageUP" and "PageDOWN" to make a selection. The default value is "Floppy", which means that the system will read the startup information from the floppy drive first when booting, which is very unsuitable for our normal machine. Because it's the era of Windows9x, you don't need a boot disk in normal times, so it's futile to read the floppy disk every time you start it, and it will lengthen the startup time of the machine and shorten the life of the floppy disk. So we have to choose "HDD-" to boot directly from the hard disk, so that the boot will be faster. Go back to the home page and select "Adranced Chipset Features". The settings in this option have a great influence on the acceleration of the machine. Please pay more attention. Change "Bank /1 DRAM Timing" from "8ns/1ns" to "Fast" or "Turbo". "Turbo" is faster than "Fast", but it is not stable. It is recommended to choose "Fast". If the memory quality is good, you can choose "Turbo" and change it back to "Fast" if it is unstable. When you look down, you will find the option of SDRAM CAS Latency. It is best to choose "2" for those with good memory quality, but it is recommended to choose "3" based on stability. In the future, it will always be "DRAM Clock", which allows you to run the memory at a high clock frequency. "66 to 1" or "1 to 133" is now mostly PC133, so you can change it with confidence. It's all the same sentence, "If it's unstable, it can be changed." (Note: Some versions use +33, but the meaning is the same. ) Newer motherboards all support AGP4X. If your graphics card also supports AGP4X, activate it in "AGP-4XMode", which will give full play to the capabilities of the graphics card. Remember not to waste it if both are supported! (Note: the activation of 4X is not a single problem, but it is only a prerequisite for opening 4X, and we will analyze it in detail later.) The next item is "AGP Aperture Size", which is the amount of system call memory for video memory. With the gradual popularization of graphics cards with large video memory, this option has little meaning. After testing, there is almost no difference among 16M, 32M, 64M and 128M. Even if 16M is less than 2% different from 128M, so don't let too much memory wait for that useless task, just free them up, and choose 16M or 32M is enough. In fact, there are many settings in the BIOS, but the effect is not obvious, so let's put them down first, and declare the "heart-picking operation" ended successfully, and select "Save &; Exit Setup "press" y "to restart. After the "coring action", 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, let's conquer it ourselves. 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 being turned on, which indicates that all the programs will be opened in the background as soon as you turn on the computer). 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 just need to press "Start/Run/Type" msconfig "to confirm/enter the program and then press" Start "to see all the programs started with the system here, just empty the box in front of the programs that we don't want to start. It is suggested that all unused ones be removed, 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 the hard disk light flashing after the restart. Really happy, haha! After fully entering Windows, we can make the following settings: First, start the DMA mode to improve the speed of the hard disk. The highest transfer rate of the hard disk using UDMA/33, 66 and 1 technologies is 33MB/s, 66MB/s and 1MB/s, which is 3~6 times that of the IDE hard disk (here refers to PIO MODE4 mode, and its transfer rate is 16.6MB/s). But in the default settings in Windows, DMA is disabled, so we must turn it on. Enable DMA: Open the window of Control Panel/System/Device Manager, expand the branch of Disk Drives, double-click the icon of UDMA hard disk, enter Properties/Settings/Options, tick the item DMA, and then press OK to close all dialog boxes and restart the computer. Second, increase the cache and improve the performance of CD-ROM. First, select the "My Computer" icon, click the right mouse button to open the "System Properties/Performance/File System /CD-ROM" window, then drag the cursor of "Additional Cache Size" to the maximum (rightmost), set the "Additional Access Method" to "Four Times or Higher", and then click "OK". Third, defragment the hard disk. After a long period of 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, so that the performance of the system can be improved. (Note: This work will take a long time. (4) Improve the MODEM Speed Right-click My Computer, open System Properties/Device Manager, expand the Modem branch, and then double-click the icon of the modem you are using to pop up the Properties dialog box, select the item Modem, and set the Maximum Speed to 1152. Switch to the Connection item in the Properties dialog box, click the Advanced button, select Hardware in the Use Flow Control check box, 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 cursors of "Receive Buffer" and "Transmit Buffer" to the "high" end, and click "OK". 5. Use 32-bit file allocation table (FAT32) If you are a user of WIN98, it is best to use FAT32(32-bit partition) for the best performance. Because FAT32 is faster and saves space than FAT16, its compatibility is also affirmed. How to use it: Open the Explorer and click on the.