Hi! Yes you can reset Chrome:
Click on the three dots upper right:
Scroll down to Settings
Scroll down to Advanced
Scroll down to Reset (Restore settings to their original defaults)
Bookmarks and passwords will not change and your passwords (if you have them ) will remain. The following will change:
Default search engine
Homepage and tabs
The new tab page
Tabs you have pinned
Cookies and site data
Extensions and themes
Regarding a cure for the slowness, I am not experienced to address that issue. I am confident a more experienced member will follow my post to address that concern.
Let us know if your reset works!