Piwik behind varnish

I was wondering putting piwik.js behind varnish reverse-proxy. Could it help?
It would help also static stuffs rendered inside admin interface?
I mean could it render faster png graphs and js graphs?

UP! Does anyone of you tried to put just piwik.js behind reverse proxy (es: varnish)? Would help serving Piwik tracker faster?

No putting piwik.js will not help with the speed. Please check out: Optimize and Scale Piwik - Analytics Platform - Matomo