cFosSpeed specifications

What's new in version 9.64

  • Added VDSL as medium.  Setting this and switching on MTU optimization could result in a 2% speed increase.
  • Connections with protocols UNKNOWN and UNKNOWN_BULK are first matched against program names and only afterwards against protocols. Thus, if no proper protocol is detected, program prios take over (if possible, that is, if the program is listed and its prio is != normal) and only if those don't match, then protocol prio is used (but again, only if that is not set to normal).
  • Fixed a bluescreen when sleeping/waking up.
  • Fixed bug in TCP MSS optimization.  This could have fixed a bug in bulk detection as well.
  • Hopefully fixed a bluescreen while deinstalling.
  • Removed install warning with Qihoo 360safe and newer products.
  • Changed headings and switches in "spd cons" from mss/lss/ass to mtu/ltu/atu, since they now show IP-agnostic values (MTU is TCP segment size minus TCP/IP header length, which is different in IPv4 and IPv6).


  • Publisher cFos Software
  • Publisher web site
  • Release date July 21, 2014
  • Date added August 11, 2014
  • Version 9.64


System requirements

  • Operating systems Windows 7, Windows 2003, Windows 8, Windows Vista, Windows XP
  • Additional requirements Not available

Download information

  • File size 5.06MB
  • File name cfosspeed-v964.exe


  • Total Downloads 226,973
  • Downloads last week 578


  • License model Free to try
  • Limitations 30-day trial
  • Price $22.90