Help! My broadband highspeed internet is running slow

i have comcast highspeed internet that i pay twice as much as dsl for. it is advertised to be at least twice as fast as dsl. but it started running very slow recently. i ran a test on pcpitstop and cnet website to test my speed. i am not getting any more than 600 kbps. before, i used to get over 5000 kbps. i thought the problem was my 4 yr old dlink 614+ router so i went and bought a wireless linksys 2.4ghz 802.11g and payed extra for speed booster. my internet speed stayed the same. then i thought the problem was my comcast modem. so i reset it with a pin, but my internet speed was still slow. what can be the problem?

note: i only use a wired connection and i have 4 pcs connected to the router through the cat5 outlets in seperate rooms. my d-link router was also slow before with only 1000 kbps. but after resetting it, i had over 5000 kbps for about a month before my speed became slow again.

Test the Speeds during different times of the day.
This would be a good way to test if things are over-subscribed.

If it is, you will see better performance at 5am than you do at 8pm.

Also, connect your PC directly to the Cable Modem to eliminate the router completely.

Also try doing a ping -t xxx.xxx.xxx.xxx where this is the Cable Modem's router. Then try it against Yahoo.

If the first is slow, then there could be an issue on your local loop.
If the first is fast but the 2nd is slow, there could be an issue on one of the routers a bit further out.

I would run the tests and then contact comcast with the results.
600KB is not acceptable currently.

I know I had "oversubscription" issues with Cable so I switched to DSL for more speed. My cable was fine except for between say 6pm and 11pm when it dropped way ways down.

You may visit this website http://increaseinternetspeed.net/ This site contains the tips to increase the internet speed .And You can check Your internet speed in the site http://www.ip-details.com/

Below are tests I made recently from same computer/environment on Comcast.
Note at times I was getting super response !

Fri Oct 30 09:26:27 2009 23986 kbps
Tue Nov 3 12:55:26 2009 17340 kbps




Download Speed: 690 kbps (86.3 KB/sec transfer rate)
Upload Speed: 554 kbps (69.3 KB/sec transfer rate)
Latency: 27 ms
Fri Oct 30 19:59:35 2009


Download Speed: 675 kbps (84.4 KB/sec transfer rate)
Upload Speed: 491 kbps (61.4 KB/sec transfer rate)
Latency: 23 ms
Fri Oct 30 08:40:14 2009

Download Speed: 661 kbps
(82.6 KB/sec transfer rate)
Upload Speed: 526 kbps (65.8 KB/sec transfer rate)
Latency: 20 ms
Fri Oct 30 08:43:13 2009

Download Speed: 654 kbps (81.8 KB/sec transfer rate)
Upload Speed: 473 kbps (59.1 KB/sec transfer rate)
Latency: 21 ms
Fri Oct 30 08:50:56 2009

Download Speed: 592 kbps (74 KB/sec transfer rate)
Upload Speed: 568 kbps (71 KB/sec transfer rate)
Latency: 27 ms
Fri Oct 30 08:58:04 2009

Download Speed: 23986 kbps (2998.3 KB/sec transfer rate)
Upload Speed: 3771 kbps (471.4 KB/sec transfer rate)
Latency: 18 ms
Fri Oct 30 09:26:27 2009

Download Speed: 641 kbps (80.1 KB/sec transfer rate)
Upload Speed: 343 kbps (42.9 KB/sec transfer rate)
Latency: 26 ms
Sun Nov 1 21:28:02 2009

Download Speed: 358 kbps (44.8 KB/sec transfer rate)
Upload Speed: 139 kbps (17.4 KB/sec transfer rate)
Latency: 24 ms
Mon Nov 2 22:48:52 2009

Download Speed: 4768 kbps (596 KB/sec transfer rate)
Upload Speed: 3088 kbps (386 KB/sec transfer rate)
Latency: 20 ms
Tue Nov 3 07:21:04 2009

Download Speed: 601 kbps (75.1 KB/sec transfer rate)
Upload Speed: 437 kbps (54.6 KB/sec transfer rate)
Latency: 24 ms
Tue Nov 3 10:31:18 2009


Download Speed: 4915 kbps (614.4 KB/sec transfer rate)
Upload Speed: 2977 kbps (372.1 KB/sec transfer rate)
Latency: 22 ms
Tue Nov 3 11:31:56 2009

Download Speed: 18055 kbps (2256.9 KB/sec transfer rate)
Upload Speed: 3066 kbps (383.3 KB/sec transfer rate)
Latency: 17 ms
Tue Nov 3 12:55:26 2009

Download Speed: 5308 kbps (663.5 KB/sec transfer rate)
Upload Speed: 1378 kbps (172.3 KB/sec transfer rate)
Latency: 17 ms
Tue Nov 3 13:21:22 2009


Download Speed: 17340 kbps (2167.5 KB/sec transfer rate)
Upload Speed: 1744 kbps (218 KB/sec transfer rate)
Latency: 18 ms
Tue Nov 3 15:07:56 2009

Download Speed: 441 kbps (55.1 KB/sec transfer rate)
Upload Speed: 233 kbps (29.1 KB/sec transfer rate)
Latency: 28 ms
Wed Nov 4 11:24:50 2009

Download Speed: 590 kbps (73.8 KB/sec transfer rate)
Upload Speed: 398 kbps (49.8 KB/sec transfer rate)
Latency: 26 ms
Wed Nov 4 12:06:29 2009

Download Speed: 616 kbps (77 KB/sec transfer rate)
Upload Speed: 513 kbps (64.1 KB/sec transfer rate)
Latency: 26 ms
Wed Nov 4 12:11:03 2009

Download Speed: 391 kbps (48.9 KB/sec transfer rate)
Upload Speed: 446 kbps (55.8 KB/sec transfer rate)
Latency: 28 ms
Wed Nov 4 13:59:43 2009

Download Speed: 391 kbps (48.9 KB/sec transfer rate)
Upload Speed: 360 kbps (45 KB/sec transfer rate)
Latency: 26 ms
Wed Nov 4 14:55:59 2009

Download Speed: 570 kbps (71.3 KB/sec transfer rate)
Upload Speed: 361 kbps (45.1 KB/sec transfer rate)
Latency: 23 ms
Wed Nov 4 15:41:08 2009