For security reasons, I highly recommend everyone go into chrome://settings/content/v8 and select "Don’t allow sites to use the V8 optimizer". (This is Chromium's JIT compiler, for those who know what that means).
This will make your browser slower! However, it's not nearly as bad as I expected (I lost one point in browserbench.org), and it will make your browser measurably more secure. In particular, a very dangerous new exploit has come out—the worst kind, it allows websites to run code on your computer outside the browser—and Chromium Legacy has not been updated with a patch.
You can re-enable the V8 optimizer for individual websites you trust, speeding them up.