1)Most Internet connectivity problems can be solved by turning the modem off and then back on again, turn the modem off for 15 seconds and then turn it back on some models may require you to pull the power cable out and re-attach it.

2)Power cycle network devices if you have your modem connected to other network devices like a router, switch or server, you will need to power cycle or restart these devices.

3)Disconnect all other devices sharing the ADSL line, devices such as a fax or phone using the same phone line as the ADSL may at times cause interference to the ADSL signal.RFI (Radio Frequency Interference) / EMI (Electro Magnetic Interference) RFI / EMI emitting devices can degrade the ADSL signal, cause retransmissions and slow things down. Things to be suspicious of include cordless phones, speakers, power supplies, light dimmer switches, high intensity lightning, and surge protectors.  Moving the modem or rerouting the cables is sometimes enough.

4)Check that the modem is not overheating.

5)Keep the phone cable between the modem and the wall jack as short as possible.

6)
Find and remove viruses. Viruses can slow your computer's performance, especially if they've deleted or corrupted critical files.

7)
Find and remove spyware. Spyware can run silently in the background whenever your computer is operating, draining memory and processing resources and significantly slowing your system's performance.

8) Free up space on your hard drive. The amount of free space on your hard drive can also affect your computer's performance. A regular routine of maintenance procedures can help keep your computer running efficiently.
Slow Browsing
Before contacting the Airtel HelpDesk, try the following:
Internet Congestion

Certain websites may download very slow or be unreachable depending on the condition of the Internet and the time of day. Try a variety of other websites, both within India and overseas and see if you experience any delay from these other websites.

Network Setup

Do you have a Local Area Network? How many computers are accessing the Internet? Is anyone downloading any large files from the Internet and/or transferring large files between computers on the network? Are there any computers running software sharing programs? All these factors will decrease the available bandwidth and you may experience slower transfer rates.

Viruses / Worms

Your bandwidth can be utilized by malicious viruses and worms to replicate themselves from infected machines. This can slow your network down considerably. Please make sure your network has the latest virus definition tables from your Anti Virus vendor and that you have also installed the latest Microsoft patches.
Reasons for Slow Browsing:
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