slow browsing while fast file download on satellite Internet link
Hello,
I have 2-way satellite broadband internet link using iDirect satellite modem (Please note that using 2-way satellite internet is subject to latency of min 600 ms to the 1st hop). When I download a file from HTTP, I got fast downloading rate like 400 kbps and same as when uploading a file to HTTP web page.
The problem is on browsing web pages. Once a web page called through a browser, the page download part of its content and then hold up waiting the other parts. Such waiting may exceed the time up setting of the browser and hence the browser give up while the page has half contents. To solve this issue, I have to force reloading/refreshing the page about 3-5 times.
This happen on all web pages even those that are famous like Google, Yahoo, MSN, Experts-Exchange ...etc. I'm tried most popular web browsers like Firefox, IE8, Chrome and Flock all latest versions but with no help!
It seems to me that on multiple TCP sessions towards HTTP resources get some to be broken during downloading them. While on a single download TCP session, the session get fast downloading speed.
What kind of web accelerators do you suggest that internally designed for satellite links having high latency? Perhaps using TCP optimization for satellite links is a necessity?
I'm using Vista 32-OS in case you would like to suggest an optimization tool or web accelerator tool.
Thank you in advance ...
I have 2-way satellite broadband internet link using iDirect satellite modem (Please note that using 2-way satellite internet is subject to latency of min 600 ms to the 1st hop). When I download a file from HTTP, I got fast downloading rate like 400 kbps and same as when uploading a file to HTTP web page.
The problem is on browsing web pages. Once a web page called through a browser, the page download part of its content and then hold up waiting the other parts. Such waiting may exceed the time up setting of the browser and hence the browser give up while the page has half contents. To solve this issue, I have to force reloading/refreshing the page about 3-5 times.
This happen on all web pages even those that are famous like Google, Yahoo, MSN, Experts-Exchange ...etc. I'm tried most popular web browsers like Firefox, IE8, Chrome and Flock all latest versions but with no help!
It seems to me that on multiple TCP sessions towards HTTP resources get some to be broken during downloading them. While on a single download TCP session, the session get fast downloading speed.
What kind of web accelerators do you suggest that internally designed for satellite links having high latency? Perhaps using TCP optimization for satellite links is a necessity?
I'm using Vista 32-OS in case you would like to suggest an optimization tool or web accelerator tool.
Thank you in advance ...
Try 2 or 3 sites at different distances from you on http://www.speedguide.net/speedtest/
to get an average baseline speed... say, 1 from the US, 1 from DE, and the 1 in Jakarta, then copy and paste the results (or at least the links to the image showing the up/down speeds) to notepad to save for comparison later.
Then see what the TCP Analyzer says at http://www.speedguide.net/analyzer.php
Especially note the RWIN value currently set and those recommended, and the calculated maximum speeds possible under the ''bandwidth * delay product'' heading with theoretical ping times.
All the satellite providers I'm aware of will throttle back your bandwidth if you exceed the 'average use' (it's in the fine print of the contract), but it doesn't sound like that is what is happening in your case.
to get an average baseline speed... say, 1 from the US, 1 from DE, and the 1 in Jakarta, then copy and paste the results (or at least the links to the image showing the up/down speeds) to notepad to save for comparison later.
Then see what the TCP Analyzer says at http://www.speedguide.net/analyzer.php
Especially note the RWIN value currently set and those recommended, and the calculated maximum speeds possible under the ''bandwidth * delay product'' heading with theoretical ping times.
All the satellite providers I'm aware of will throttle back your bandwidth if you exceed the 'average use' (it's in the fine print of the contract), but it doesn't sound like that is what is happening in your case.
> Especially note the RWIN value currently set and those recommended
I believe vista is supposed to 'autotune' that value for you, but maybe it's not optimized for 44,000+ mile delay times.
I believe vista is supposed to 'autotune' that value for you, but maybe it's not optimized for 44,000+ mile delay times.
ASKER
Dear Merete,
Thanks for your reply. I don't use SpyDoctor or any variant like it, but I use Kaspersky Internet Security (KIS) ver. 9.0.0.459 that use web traffic analysis in a kind that intercept web traffic by local host proxy. However disabling KIS did never solve my issue.
Changing power setting for wireless adaptor is not my case as my PC connected via Ethernet interface.
Dear Darr247,
Per your instructions, I'm attaching in Code Snippet area the following test results:
Speed test from erver in Ca, USA.
Speed test from server in Nietherland
Speed test from server in Jakarta.
TCP/IP analysis
Ping test from my PC to a remote host in US.
Trace route from my PC to a remote host in US.
Please note that my PC now is Win XP 32-bit, but I will do same tests on my Vista PC tomorrow when it get repaired!
Satellite providers use what its called shared link that has bib capacity but shared at least between 20 remotes users and it denoted as contention ratio of 1:20; my link is 1:20 with max download speed of 512 kbps and max upload speed of 128 kbps, but not all 20 remotes are online on same time and thus I can get bandwidth daily not less than what you see in speed test results.
Kindly advice ...
Inet-Speed-test-from-kneus-Serve.gif
Inet-Speed-test-from-biznetnetwo.gif
Thanks for your reply. I don't use SpyDoctor or any variant like it, but I use Kaspersky Internet Security (KIS) ver. 9.0.0.459 that use web traffic analysis in a kind that intercept web traffic by local host proxy. However disabling KIS did never solve my issue.
Changing power setting for wireless adaptor is not my case as my PC connected via Ethernet interface.
Dear Darr247,
Per your instructions, I'm attaching in Code Snippet area the following test results:
Speed test from erver in Ca, USA.
Speed test from server in Nietherland
Speed test from server in Jakarta.
TCP/IP analysis
Ping test from my PC to a remote host in US.
Trace route from my PC to a remote host in US.
Please note that my PC now is Win XP 32-bit, but I will do same tests on my Vista PC tomorrow when it get repaired!
Satellite providers use what its called shared link that has bib capacity but shared at least between 20 remotes users and it denoted as contention ratio of 1:20; my link is 1:20 with max download speed of 512 kbps and max upload speed of 128 kbps, but not all 20 remotes are online on same time and thus I can get bandwidth daily not less than what you see in speed test results.
Kindly advice ...
« SpeedGuide.net Speed Test Results »
251 kbps down (~0.25 Mbps, 31 KB/s)“
48 kbps up (~0.05 Mbps, 6 KB/s)‘
500 KB downloaded in 16.322 seconds
100 KB uploaded in 17.006 seconds
Tested on: 2009.07.13 15:17 EDT
Tested from: hostkitty.net
Test Link: http://www.speedguide.net/speedtest/results.php?test=2500661
« SpeedGuide.net Speed Test Results »
392 kbps down (~0.39 Mbps, 48 KB/s)“
52 kbps up (~0.05 Mbps, 6 KB/s)‘
500 KB downloaded in 10.458 seconds
100 KB uploaded in 15.709 seconds
Tested on: 2009.07.13 15:24 EDT
Tested from: kneus.nl
Test Link: http://www.speedguide.net/speedtest/results.php?test=2500668
« SpeedGuide.net Speed Test Results »
316 kbps down (~0.32 Mbps, 39 KB/s)“
51 kbps up (~0.05 Mbps, 6 KB/s)‘
500 KB downloaded in 12.949 seconds
100 KB uploaded in 16.047 seconds
Tested on: 2009.07.13 15:27 EDT
Tested from: biznetnetworks.com
Test Link: http://www.speedguide.net/speedtest/results.php?test=2500672
« SpeedGuide.net TCP Analyzer Results »
Tested on: 07.13.2009 15:32
IP address: 77.95.xxx.xx
Client OS: Windows XP
TCP options string: 020405b401010101
MSS: 1460
MTU: 1500
TCP Window: 1460 (multiple of MSS)
RWIN Scaling: 0 bits
Unscaled RWIN : 1460
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 58kbps (7KBytes/s)
BDP limit (500ms): 23kbps (3KBytes/s)
MTU Discovery: ON
TTL: 112
Timestamps: OFF
SACKs: OFF
IP ToS: 00000000 (0)
C:\Documents and Settings\Moody>ping 4.2.2.1 -n 50
Pinging 4.2.2.1 with 32 bytes of data:
Reply from 4.2.2.1: bytes=32 time=628ms TTL=243
Reply from 4.2.2.1: bytes=32 time=872ms TTL=243
Reply from 4.2.2.1: bytes=32 time=788ms TTL=243
Reply from 4.2.2.1: bytes=32 time=788ms TTL=243
Reply from 4.2.2.1: bytes=32 time=770ms TTL=243
Reply from 4.2.2.1: bytes=32 time=689ms TTL=243
Reply from 4.2.2.1: bytes=32 time=790ms TTL=243
Reply from 4.2.2.1: bytes=32 time=884ms TTL=243
Reply from 4.2.2.1: bytes=32 time=664ms TTL=243
Reply from 4.2.2.1: bytes=32 time=884ms TTL=243
Reply from 4.2.2.1: bytes=32 time=790ms TTL=243
Reply from 4.2.2.1: bytes=32 time=646ms TTL=243
Reply from 4.2.2.1: bytes=32 time=891ms TTL=243
Reply from 4.2.2.1: bytes=32 time=613ms TTL=243
Reply from 4.2.2.1: bytes=32 time=880ms TTL=243
Reply from 4.2.2.1: bytes=32 time=966ms TTL=243
Reply from 4.2.2.1: bytes=32 time=843ms TTL=243
Reply from 4.2.2.1: bytes=32 time=716ms TTL=243
Reply from 4.2.2.1: bytes=32 time=746ms TTL=243
Reply from 4.2.2.1: bytes=32 time=748ms TTL=243
Reply from 4.2.2.1: bytes=32 time=767ms TTL=243
Reply from 4.2.2.1: bytes=32 time=758ms TTL=243
Reply from 4.2.2.1: bytes=32 time=745ms TTL=243
Reply from 4.2.2.1: bytes=32 time=949ms TTL=243
Reply from 4.2.2.1: bytes=32 time=639ms TTL=243
Reply from 4.2.2.1: bytes=32 time=832ms TTL=243
Reply from 4.2.2.1: bytes=32 time=912ms TTL=243
Reply from 4.2.2.1: bytes=32 time=817ms TTL=243
Reply from 4.2.2.1: bytes=32 time=748ms TTL=243
Reply from 4.2.2.1: bytes=32 time=773ms TTL=243
Reply from 4.2.2.1: bytes=32 time=729ms TTL=243
Reply from 4.2.2.1: bytes=32 time=940ms TTL=243
Reply from 4.2.2.1: bytes=32 time=640ms TTL=243
Reply from 4.2.2.1: bytes=32 time=951ms TTL=243
Reply from 4.2.2.1: bytes=32 time=702ms TTL=243
Reply from 4.2.2.1: bytes=32 time=709ms TTL=243
Reply from 4.2.2.1: bytes=32 time=744ms TTL=243
Reply from 4.2.2.1: bytes=32 time=581ms TTL=243
Reply from 4.2.2.1: bytes=32 time=889ms TTL=243
Reply from 4.2.2.1: bytes=32 time=902ms TTL=243
Reply from 4.2.2.1: bytes=32 time=639ms TTL=243
Reply from 4.2.2.1: bytes=32 time=779ms TTL=243
Reply from 4.2.2.1: bytes=32 time=866ms TTL=243
Reply from 4.2.2.1: bytes=32 time=762ms TTL=243
Reply from 4.2.2.1: bytes=32 time=813ms TTL=243
Reply from 4.2.2.1: bytes=32 time=813ms TTL=243
Reply from 4.2.2.1: bytes=32 time=870ms TTL=243
Reply from 4.2.2.1: bytes=32 time=977ms TTL=243
Reply from 4.2.2.1: bytes=32 time=622ms TTL=243
Reply from 4.2.2.1: bytes=32 time=873ms TTL=243
Ping statistics for 4.2.2.1:
Packets: Sent = 50, Received = 50, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 581ms, Maximum = 977ms, Average = 786ms
C:\Documents and Settings\Moody>tracert -d 4.2.2.1
Tracing route to 4.2.2.1 over a maximum of 30 hops
1 2 ms 2 ms 2 ms 192.168.0.1
2 3 ms 3 ms 7 ms 77.95.xxx.xxx
3 793 ms 800 ms 825 ms 172.16.0.43
4 736 ms 600 ms 671 ms 172.16.0.101
5 868 ms 738 ms 635 ms 62.101.104.33
6 861 ms 731 ms 764 ms 213.140.6.1
7 866 ms 901 ms 889 ms 89.97.200.249
8 686 ms 895 ms 902 ms 89.97.200.69
9 705 ms 903 ms 892 ms 195.22.192.73
10 987 ms 706 ms 666 ms 89.221.34.107
11 721 ms 637 ms 810 ms 195.22.211.38
12 1021 ms 586 ms 640 ms 4.68.23.190
13 728 ms 734 ms * 4.69.140.25
14 864 ms 893 ms 669 ms 4.69.132.137
15 802 ms 788 ms 901 ms 4.69.141.150
16 771 ms 826 ms 794 ms 4.69.133.89
17 897 ms 896 ms 890 ms 4.69.141.170
18 903 ms 895 ms 898 ms 4.69.132.133
19 700 ms 795 ms 692 ms 4.69.139.98
20 899 ms 802 ms 901 ms 4.2.2.1
Trace complete.
C:\Documents and Settings\Moody>
Inet-Speed-test-from-kneus-Serve.gif
Inet-Speed-test-from-biznetnetwo.gif
ASKER CERTIFIED SOLUTION
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one source I found that caused this problem was the program SpySweeper.
If the Common Ad Sites shield is enabled web browsing with Java-heavy websites in Vista will be painfully slow.
Disable Spysweeper if you have it returned the speed.
Another sourced solution for slow web browsing disable this-->
control panel --> Device Manager --> Network Adapters --> Wireless Adapter --> Power Settings and UNCHECKED "Allow the computer to turn off this device to save power .
Hope it assists you