node.js - Grunt slow after couple of hours -

node.js - Grunt slow after couple of hours -

ever since reinstalled computer fresh win8 installation, seems grunt (or node?) slowing downwards after couple of hours.

at first it's compiling in ~3s , after couple hours (in case of image after 5 hours, it's more after 2 hours) slows downwards ~30s.

when restart computer problem gone couple of hours 1 time again , it's back.

i can't find else problem , can't find solution. 'node -v' takes ~30s. tried 'npm cache clean' , reinstalling node , sass. , slows downwards sass tasks, not requirejs tasks example.

i'm using grunt-contrib-sass - https://github.com/gruntjs/grunt-contrib-sass.

node.js gruntjs