Just posted this at the forum:
Just tried latest SJ 5 on a Win7 x64 machine. Ran 9%-16% of CPU idling with three tabs open. Noticed because laptop fan began accelerating. Reverted to 4.15 via windows restore point, still needed a complete SJ reinstall with new user profile. cpu usage with same tabs back to 0-1% with 4. I don't think 5's problems are relegated to Linux, and i don't think it should be the site's primary download. I'm staying with 4 until I think something's changed.
Also, ublock origin is hitting more script ads than built-in adblock plus, and has a far more useful interface.