first, you use a lot of javascript special effects.

For example, mouse special effects, column special effects on the page, status bar special effects, and so on. The principle of these special effects is to download them from the server to your local machine, and then run them on your local machine before you can see them. You have done a lot of special effects, and it will take you a long time to complete them on your local machine, but if your machine configuration is average, it will be even slower. Even if all the special effects are completed, your page will be very uncomfortable to use.

javascript brings not only slow speed, but also a very important point is that most people don't know how it is written when they use it, and they just copy it from other stations. First, in the process of circulation, some code will be lost, and as a result, you may copy wrong or incomplete code, which will lead to paralysis of your website. Secondly, if someone who plays a prank disguises malicious code as special effect code to you, but you don't understand it and copy it to the website, not only will you be victimized when you open your website, but others may also be victimized when they open your website.

Therefore, it is suggested that javascript special effects (within three special effects) should be used sparingly, otherwise it will definitely do harm to your website. If you want to use it, you should choose a safer special effect code, copy it at a better site, and don't go to a miscellaneous station.

second, you used large unprocessed pictures on the page.

After the images are processed, the number of bytes can be reduced, otherwise many images will occupy a lot of space at the beginning and make the website open slowly. Photoshop, fireworks and other drawing software can be used to reduce the size of the picture.

reason 3: there are flash or video files on your page.

Many netizens like to make flash animations and songs on the homepage of their own stations, or broadcast live on TV or movies. In fact, this will greatly slow down the opening speed of your page. Although flash can be downloaded and played at the same time, it can't be downloaded smoothly due to network reasons. As a result, your page will always be in a state of waiting for download, and it can't be completed smoothly. Movies and TV broadcasts are even worse. They usually have to be buffered and downloaded for a short period of time before they can start playing. If the network is not good, they can't be downloaded and played. So I suggest you use less big flash and less live video (preferably not).

reason 4: quoting too much from other websites

this actually includes pictures, audio-visual files, etc. that you quote from other websites, but it also includes everything that you quote from other websites. If you directly refer to something from another website on the page, and the speed of that website is slow, or the page of that website no longer exists, then your opening speed will be very slow.

reason 5. you point some domain names you applied for in other places to your own website

generally, if the top-level domain name points directly, it will not have a great impact on the speed. However, there are many domain names of several levels that are applied for free in other places, and their speed is very slow. After several turns, the speed is even slower.

reason 6. there may be wrong code on your station. Find out the error code and correct it!

reason 7. there are viruses in the system, especially worms, which seriously consume system resources, can't open the page, or even crash.

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.

eight reasons: the bandwidth of the server itself is insufficient and the speed is slow.

reason 9: the bandwidth of the server itself is enough, which limits you to death and is slow.

reason 1. users and websites are in different network segments, and the lines such as telecom, netcom, mobile and tietong cause slow speed. For example, your server is in telecom, and you use Netcom to access it.

reason 11. your database is too big to bear.

reason 12: it's all rogue plug-ins.

reason XIII. the setting of the network firewall does not allow multithreading access. for example, at present, WinXPSP2 restricts this by default, which greatly restricts the use of multithreading download tools, such as BT and Thunder. Therefore, opening too many pages at the same time will also lead to the problem of slow opening of web pages.

reason 14. the local network speed is too slow, and the problem of slow webpage opening will also occur when too many computers * * * enjoy surfing the internet, or when a large number of users * * * enjoy downloading.

reason 15. there are bugs in the browser used. for example, some beta versions of multi-window browsers also have the problem of slow opening web pages.

reason 16. the load of the website visited is too heavy, the bandwidth is relatively too narrow, the program design is unreasonable, and the problem of slow opening of the webpage will also occur.

reason XVII: network intermediate equipment problems, line aging, virtual connection, router failure, etc.

reason XVIII. is it related to system vulnerabilities? it's hard to say that viruses such as shock waves spread through vulnerabilities and cause the system to be slow or even paralyzed.

reason XIX. 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.

reason 2. the existence of loops in the network 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 generally 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, 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.

Reason 21. Broadcasting storm caused by hardware failure of network equipment leads to 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 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.

Reason 22. A certain port in the network has formed a bottleneck, which leads to the slow speed of the network

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.

Reason XXIII. 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.

Reason XXIV. 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.

Cause 25. The network speed slows down due to the hardware failure of network equipment

Regularly clean up the dust inside the chassis

Cause 26. Unreasonable page layout causes the speed of webpage opening

For example, my website is placed on my own server, that is, when I open the home page, my head will open quickly, but the middle part will pause for about 3-5 seconds. Even when testing on this machine, the same problem exists. Did I call js too much, or did I call too many tags? I used the page modified by the popular version of the template. Can you tell me the reason? This is caused by putting too much content in the same table. The solution is to use multi-level tables in a web page (tables are stored from top to bottom in the web page, not nested in the same big table) to store content.