Find the source of slow speed

First, the network itself problem

The destination Web site you want to connect to is on a server with insufficient bandwidth or too much load. The processing method is very simple, please change the time period to go up again or change a target website.

Second, the network has a circuit to slow the speed

This phenomenon rarely occurs when the number of nodes involved in the network is not many and the structure is not very complex. However, in some more complex networks, there are often redundant lines, such as inadvertently connected to form a circuit. For example, cable from the network Center to a computer room, and then from the computer room to the second room computer. At the same time from the network Center and a standby line directly connected to the computer room two, if the several lines connected at the same time, the formation of the circuit, the packet will continue to send and verify data, thus affecting the overall speed. This is a difficult situation to find. In order to avoid this situation, we must be in the laying of the network of good habits: network cable marked on the label, there is a standby line of the place to do a record. When such a failure occurs, it is generally used in a step-by-step approach to partition segmentation.

Third, network cable problems caused by slow speed

We know that twisted-pair wires are tightly twisted and together by four pairs of lines to reduce crosstalk and background noise. At the same time, only 1, 2 and 3, 64 lines of twisted pair are used in the T568A standard and the T568B standard, where 1, 2 are used for sending, 3, 6 is used for reception, and 1, 2 must come from a winding pair, 3, 6 must come from a revolve pair. Only in this way can the maximum avoid crosstalk and ensure data transmission. In practice, I found that not according to the correct standard (T586A, t586b) The production of network cable, there are a lot of hidden dangers. The performance is: one kind of situation is when starts to use the network speed is very slow, the other kind of situation is starts the net speed to be normal, but after some time, the net speed slows down. The latter situation is evident on desktop computers, but the speed at which the computer is checked with a laptop is normal. For this problem I have been found for many years, due to not according to the correct standard made by the network cable caused by slow speed and the quality of the network card. General desktop computer network card performance is not as good as notebook computer, therefore, in the use of the Exchange method to troubleshoot, the use of notebook computers to detect the normal speed of the network does not rule out the existence of the problem. We are now required to press T586A, t586b Standard to suppress the network cable, in the detection of faults can not be used to replace the desktop computer notebook computer.

Four, the network of a port to form a bottleneck leading to slow speed

In fact, routers WAN and LAN ports, switch ports, hub ports, and server network cards can become network bottlenecks. When the speed is slow, we can use the network management software to view the data traffic of routers, switches and server ports during the peak period, and can also use the netstat command to count the data traffic of each port. This confirms the location of network data flow bottleneck and tries to increase its bandwidth. Many specific methods, such as replacing the server network card for 100M or 1000M, installing multiple network cards, dividing multiple VLANs, changing the router configuration to increase bandwidth, etc., can effectively alleviate the network bottleneck, can maximize the speed of data transmission.

V. Network equipment hardware failure caused by the broadcast storm caused by slow speed

As the main means of discovering unknown devices, broadcasting plays a very important role in the network. However, as the number of computers in the network increases, 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 NIC or network device is damaged, the broadcast packet will be sent continuously, causing the broadcast storm and paralyzing the network communication. Therefore, when the network equipment hardware failure will also cause slow speed. When you suspect such a failure, you can first replace a hub or switch with a replacement to troubleshoot a hub device failure. If these devices do not malfunction, turn off the hub or switch power, DOS under the "Ping" command to the computer involved in one test, to find a faulty network card computer, replace the new network card can restore normal speed. Network adapters, hubs, and switches are the most likely devices to cause slow internet speed.

Six, the worm's influence causes the network speed to become slow

The worm virus which is distributed through e-mail is more and more serious and harmful to the network speed. The virus causes infected users to keep sending emails as soon as they surf the internet, and the virus chooses random documents in the user's personal computer to attach to the random address of the user's address book to send mail. Hundreds of such LJ mails are queued to be sent out, and some are returned to heap on the server in batches. Cause individual backbone of the internet appears obvious congestion, network speed significantly slowed down, so that the LAN nearly paralyzed. Therefore, we must upgrade the anti-virus software in time, the computer also need to upgrade in time, install the system patch, while unloading unnecessary services, shut down unnecessary ports, in order to improve the security and reliability of the system.

Vii. Lack of system resources

You may have loaded too many applications running in the background, please load the software reasonably or remove the useless programs and files, empty the resources to achieve the goal of increasing the speed.

Viii. excessive use of firewalls

Excessive use of the firewall can also lead to slow speed, processing methods Needless to say, uninstall the unnecessary firewall to retain only a powerful enough.

Nine, the system reserved Broadband

The professional version of Windows XP retains 20% of the bandwidth by default, which is not very useful for our individual users. Instead of being idle, make full use of it as follows: Enter GPEdit in "Start → run". MSC, Open the Group Policy Editor. Find "Computer configuration → admin templates → network →qos Packet Scheduler", select "limit to retain bandwidth" on the right, select "Properties" to open the limit to retain the Bandwidth Properties dialog box, select "Disable". This reset allows you to release the reserved bandwidth of 20%.

Ten, the network card binding protocol too many

This situation is common among LAN users. If a lot of protocols are bound on the network card, when the data passes through the network card, the computer spends a lot of time to determine which protocol the data uses to transmit, then the user will feel the speed is slow. The solution is: with a network card only binding PPPoE protocol to connect ADSL, provide Internet connection, with another network card binding LAN other protocols, so that each do their job, improve performance, so that the client online speed will improve.

Xi. access to Internet interface error

This is because the Internet Connection Wizard for the Windows system caused an error in Internet interface specified by IE. Enternet 300 (Virtual dial-up software) uses the LAN type virtual dialing, while IE defaults to using normal dialing. Browse the time IE first look for dial-up interface, can not find a dial-up after the LAN has no proxy server, the last will find Enternet 300 interface, so it will be very slow. Just run through the Internet Connection Wizard again, select the LAN method, and take

Eliminate the automatic search proxy server can be resolved.

12. Cannot bind TCP/IP protocol

TCP/IP cannot be bound more than the NIC driver is improperly installed, the NIC quality problem, and the PCI slot is bad. The Device Manager should first drive the network card to remove, reboot after the installation of the driver, if not good, and then switch the NIC to a PCI slot; it is still difficult to change a network card.

13. Poor quality of telephone lines

ADSL technology on the telephone line quality requirements, the current use of ADSL is a RADSL (Rate adaptive DSL). If the telephone line between the Telecommunication Bureau and the Subscriber is interfered by the external factors in a certain period of time, the RADSL will dynamically adjust the user's access speed according to the quality of the line and the distance between transmission distances. If the visit is a foreign site, the speed will be export bandwidth and the other side of the site line, equipment configuration and other factors, the need to coordinate the whole network to solve. The main line problems are not followed by construction standards and the quality of the hidden defects, such as no plastic casing caused by the mouse bite off the line, wiring racks or other material quality problems caused by the jumper contact bad, the user in the decoration of the indoor line damaged.

14, QQ can not be networked?

You need to make some settings for it. Select the "System Parameters" command from the QQ panel and click on the "Network Settings" tab to change the original "dial-up Internet" to "LAN access Internet".

XV, ADSL equipment, poor heat dissipation

ADSL equipment work when the calorific value is relatively large, usually pay attention to heat dissipation. Many users put ADSL equipment and routers, hubs, etc. in a cabinet, not conducive to cooling, the normal work of ADSL has an impact. ADSL and other equipment can not be placed in the cabinet, to be placed separately, between the equipment to leave ventilation and cooling channels, the room is best to achieve constant temperature, general ambient temperatures should be controlled in 10~30℃.

16. Computer hardware and software problems

Hardware failure is mainly manifested in bad or not properly installed network card, computer motherboard and network card is not compatible, low computer configuration, especially with less memory resulting in slow running speed. Software failure is mainly because the user does not understand computer knowledge, incorrect operation during use, resulting in operating system errors or dial-up software damage to the Internet; After browsing some web pages, the system has problems, inadvertently delete the backup of the dial-up software; After the computer reload the system, no dial-up software is installed, etc. These software failures can be ruled out only by reinstalling the Dial-up software.

17, a Web site for a long time not open?

The reason is that in the peak of the Internet, many users visit the same hotspot site, because the Site server processing is not over, or narrow bandwidth will appear slow network speed, long time the page can not open the situation, please avoid the peak hours of the Internet or change to visit other sites.

18, due to Internet node failure

Network system is automatically routed, resulting in slow network speed. Please wait patiently for system recovery.

19, the telephone line of electrical indicators too low, caused by the slow speed of the Internet, please change the quality line.

20, outside the "cat" and the host connection rate is low, caused by the slow speed of the Internet, please reset the interface parameter settings.

21, due to the "cat" the quality of their own problems, resulting in slow internet speed. Please change your quality "cat".

22, in low-end machine running advanced operating system, caused by slow internet speed, please choose your own computer for the operating system and browser.

23, due to improper setting of the browser, caused by the slow speed of the Internet, please reset the number of days of the page, the browser's cache directory set at the highest transmission rate of the hard disk, and appropriately increase capacity.

At present, most dial-up users of computers are used in Windows, many times to hear users complain about the slow speed of the Internet, but we found that there is a situation: when it is thought that the slow is actually disconnected, but at this time the Internet icon still exists, which caused the illusion of surfing the Internet. If you have a phone around you can pick up the phone to identify, you can also pull the mouse to the Internet icon, press the right button to select "state", observe whether the data received, such as in a period of time there is no data received can be determined that the line has been disconnected, can only redial.