Portable Chrome much slower than a few releases ago

I have Portable apps Platform and Chrome (latest stable) installed on a virtual hd. Chrome is much slower than a few releases ago. It is slow starting up (loading files from the virtual hd) and retrieving web pages (poss. problem with cache, located on virtual hd.

I had normal Chrome also installed on my normal hd, and there's a Chrome folder under AppData which I suspect is still being used, but my the profile being used is on the virtual hd and the Chrome on the regular hd has been uninstalled , possibly before I noticed the slowdown.

I have been thinking that the problems were with Portable Apps Dev. I would appreciate it, if it's just a problem with my machine, if you could tell me how I might fix it. Is regular Chrome having these problems too?

Thanks,
Steven