During TCP/IP transfer, a certain amount of data needs to be confirmed upon reception before more can be sent. Stalling data confirmation results in delays and transfer-rate slowdowns, thus forcing the sender to wait. Especially for ADSL, it is possible to slow a download to a crawl by choking the upstream channel (which has the smaller bandwidth anyway) with an upload. This is because in such a scenario there is not enough upstream bandwidth left for data confirmation. The standard solution so far has been to try and compensate for this by increasing TCP window size, thereby allowing more data to be sent without immediate confirmation.

Connections:
* Broadband: Cabel and DSL
* Narrow band: Modem and ISDN
* Mobile
* Media:
o DSL, PPPoE
o DSL, PPPoA (VCmux and LLC)
o DSL, PPTP
o Cable
o ISDN
o IP over AAL
o RFC1483/2684 bridged

Routing:
* Router and dial-up connections
* LAN and WLAN
* Router and Bridge-Mode
* VPN
* Multiple connections simultaneously
* Adjustable routes
* Several IP adresses per adapter

Traffic Shaping:
* Multi-User version
* TX and RX-Shaping
* L7 Protocol Analysis
* Prioritization of Programs
* RTP/VoIP Detection
* 5 priority queues
* Individual rules with filter language

Options:
* Low-Latency Mode
* Auto-MTU optimization

Extras:
* Time and volumen budgets
* Usage Graph
* Overview of connections
* Skin-Windows
* Firewall
* Data and packet logging
* 32-Bit and 64-Bit version
* 12+ languages

Homepage - http://www.cfos.de/speed/cfosspeed_e.htm

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