VcSpawn
Runs cl.exe/link.exe with low priority in MS VisualStudio
...Those processes run with a normal priority and can make other application's work sluggish, even if the compilation is running in the background.
This application substitutes native cl.exe / link.exe files and spawns them with a lower than normal priority. As a result any other processes get enough CPU time and reacts promptly.
See Readme.txt for installation instructions.