Some time after the update to 67, I can confirm that my issues are completely resolved. This is my low power (Pentium - 4Gb RAM) browsing laptop, and not only is it not freezing, but responsiveness is distinctly better. Better than Firefox on the same machine, and feeling positively 'snappy'.
@pindos If page content is causing a problem, I think maybe it is time to consider your local resources. Lagging processor, insufficient memory, cache waiting for disk to catch up, that sort of thing?