Videos showing the benefits of activating "Automatic RWIN expansion"
Technical background
TCP Auto-Tuning measures the RTT of connections at the beginning and if data is sent. For connections with only received data and no data to send this measurement can become inaccurate, so the resulting RWIN remains too small. You can easily verify this behaviour with a fast Internet connection and high latency, for example a 50Mbit/s connection from Europe to America or a mobile broadband connection.
Results of cFosSpeed RWIN-Expansion-Award 2012
A lot of users don't get the maximum speed available for their Internet connection. In many cases the TCP Auto-Tuning of Windows 7/ Windows Vista cannot use the full download speed. In other cases the downloading programs are not written for today's high speed connections. cFosSpeed's RWIN expansion now accelerates these downloads by dynamically expanding the receive window size of the TCP connection to a value suitable for the current connection. This leads to unexpected speed improvements!
For example, we could double the download speed with Internet Explorer and nearly triple the speed of mobile UMTS downloads.
To demonstrate these dramatic speed improvements we (with the help of our users) compiled a list of scenarios in which the new cFosSpeed RWIN Expansion achieves these huge speed improvements.
| Scenario | Result | ||
|---|---|---|---|
| Software name | Connection type / RX bandwidth [Kbyte/s] | without RWIN Ext. [Kbyte/s] | with RWIN Ext. [Kbyte/s] |
| 115 Udown | 380 | 500 | |
| µTorrent | ADSL / 750 | 560 | 785 |
| AnyClient | ADSL / 384 | 260 | 280 |
| Asiasoft downloader (AVA) | ADSL / 740 | 570 | 710 |
| BitComet | ADSL / 480 | 380 | 460 |
| BitLord | ADSL / 480 | 300 | 380 |
| BitTornado | ADSL / 480 | 75 | 110 |
| bitTorrent | Cable / 1250 | 1460 | 1525 |
| Chrome Browser | Cable | 1300 | 2700 |
| Chrome Browser | 25.04 | 26.32 | |
| ClibGrab | DSL 384 | 345 | 380 |
| Comodo Dragon Browser | Cable / 300 | 80 | 110 |
| Conceiva Download Studio | ADSL/ 1290 | 930 | 1100 |
| CoolNovo Browser | ADSL/ 212 | 33 | 212 |
| Core FTP LE | ADSL/ 384 | 284 | 344 |
| CrossFTP | ADSL / 384 | 190 | 270 |
| Cryptload | ADSL / 768 | 570 | 620 |
| Cute FTP | Cable/ 6000 | 5100 | 5600 |
| Cygwin SCP | VDSL / 6250 | 1400 | 6100 |
| Download Accelarator Manager (DAM) | 60 | 480 | |
| Download Accelarator Manager (DAM) | ADSL / 300 | 400 | 530 |
| Download Accelarator Plus (DAP) | Cable / 2900 | 1500 | 2900 |
| Download Master | UMTS / 128 | 50 | 70 |
| DownThemAll! Download Manager | UMTS / 1024 | 180 | 240 |
| DownThemAll! Download Manager | Cable / 1000 | 230 | 990 |
| Dropbox | VDSL / 1250 | 300 | 400 |
| Filezilla | VDSL / 3072 | 275 | 315 |
| FilterFTP | DSL | 4700 | 8200 |
| FlashFXP | DSL / 740 | 300 | 400 |
| FlashFXPP | VDSL / 10240 | 4800 | 6500 |
| FlashGet | VDSL / 3072 | 260 | 270 |
| Free Download Manager | VDSL / 450 | 160 | 450 |
| Free Rapid Download | DSL / 450 | 180 | 370 |
| Free Rapid Download | ADSL / 240 | 160 | 190 |
| Fshare TOOL | ADSL / 512 | 300 | 480 |
| FTPRush | ADSL / 384 | 190 | 220 |
| Fushion/风行网 | ADSL / 384 | 240 | 300 |
| GetGo Download Manager | ADSL / 5900 | 290 | 490 |
| GetRight Download Manager | ADSL / 516 | 350 | 430 |
| Gigaget | ADSL / 168 | 70 | 164 |
| Go!Zilla | ADSL / 384 | 150 | 230 |
| GOG Downloader | Cable / 500 | 380 | 480 |
| GOG Downloader | ADSL / 128 | 22 | 28 |
| Google Earth | ADSL / 486 | 155 | 486 |
| GoPlay | ADSL / 470 | 160 | 364 |
| Green Browser | ADSL / 180 | 70 | 150 |
| Hidownload | Cable / 750 | 480 | 720 |
| Internet Download Manager | ADSL / 350 | 120 | 345 |
| Internet Explorer | VDSL / 6250 | 2000 | 5500 |
| JDownloader | ADSL / 250 | 180 | 250 |
| K-Ninja Browser | ADSL / 970 | 110 | 140 |
| League of Legends Downloader | ADSL / 1000 | 750 | 820 |
| LevelUp! Downloader | VDSL / 1243 | 150 | 1100 |
| Lunascape Web Browser | ADSL / 3000 | 1900 | 2000 |
| Lunascape Web Browser | ADSL | 250 | 350 |
| Magic Download Accelerator | ADSL / 450 | 380 | 430 |
| Maxton Browser | ADSL / 420 | 87 | 113 |
| Media Crawler | ADSL / 3000 | 1300 | 2100 |
| MediaGet | ADSL / 384 | 25 | 55 |
| Megashare Tool | ADSL / 768 | 590 | 640 |
| Microsoft Download Manager | VDSL / 260 | 215 | 260 |
| Mipony | VDSL / 260 | 215 | 260 |
| Mipony | 90 | 120 | |
| Mozilla Firefox | VDSL / 6250 | 5000 | 6100 |
| NetDrive + Kmplayer | ADSL | 150 | 190 |
| Net Transport | ADSL / 384 | 180 | 200 |
| Newsleecher | DSL / 2000 | 1450 | 1550 |
| Opera Browser | ADSL / 250 | 120 | 140 |
| Opera Browser | ADSL / 500 | 340 | 420 |
| Orbit Downloader | WiFi | 1900 | 2300 |
| Orbit Downloader | ADSL | 80 | 123 |
| Orbit Downloader | 290 | 420 | |
| Origin (EA Download Manager) | Cable / 1500 | 520 | 1200 |
| Origin (EA Download Manager) | / 5000 | 820 | 1600 |
| Origin (EA Download Manager) | Cable / 2000 | 330 | 500 |
| QBittorrent | DSL / 12800 | 4100 | 5300 |
| QQDownload(QQ旋风) | ADSL / 533 | 200 | 400 |
| QVOD（快播） | ADSL / 512 | 135 | 400 |
| RockMelt Browser | ADSL / 250 | 100 | 220 |
| Safari Browser | Cable / 10000 | 4200 | 5000 |
| Sleipnir Browser | WiMax / 970 | 918 | 966 |
| SmartFTP | ADSL / 240 | 130 | 220 |
| Sopcast | ADSL / 400 | 110 | 260 |
| SRWare Iron Browser | Cable / 12500 | 6875 | 11750 |
| Star Downloader | DSL / 380 | 350 | 360 |
| Steam | Cable / 300 | 150 | 280 |
| Tixati | ADSL / 124 | 80 | 120 |
| Total Commander | Cable / 6000 | 3800 | 5600 |
| Total Commander | Wireless 3G / 1000 | 100 | 200 |
| TrueDownloader | ADSL / 384 | 170 | 190 |
| TubeBox! | DSL / 384 | 350 | 375 |
| VDownloader | ADSL / 512 | 240 | 500 |
| VSO Downloader | ADSL / 384 | 160 | 300 |
| Vuze | ADSL / 480 | 360 | 400 |
| Waterfox Browser | ADSL / 500 | 210 | 330 |
| wget | ADSL / 564 | 460 | 465 |
| Windows Consumer Preview Setup | ADSL / 1280 | 1000 | 1280 |
| Windows XP updates | Cable / 1900 | 1500 | 1800 |
| Windows 7 updater | Cable / 300 | 170 | 240 |
| Win SCP | UMTS / 450 | 140 | 400 |
| WISE-FTP | ADSL / 384 | 240 | 390 |
| Wyzo Media Browser | ADSL | 350 | 440 |
| Xunlei | Cable / 4000 | 2100 | 3000 |
| Xunlei Thunder (迅雷) | ADSL / 1200 | 70 | 100 |
| Xunlei Thunder (迅雷) | ADSL / 256 | 190 | 220 |
| YTD YouTube Downloader & Converter | ADSL / 1400 | 1100 | 1250 |
| YouTube Stream | ADSL / 168 | 100 | 120 |