v2.5 is extremely laggy vs v2.4 on my GTX970. Seems to be same hashrate. Any way of getting it toned down again? Before it was possible to use computer for light browsing while mining.
Give a slightly lower intensity a try. You can also use non-integers like 19.5 or 19.9 or whatever

That should help
Thanks! Will try. What is the default intensity? (if bat file is blank with nothing specified)
The default intensity on v2.5 is 21, that is probably why you are seeing more lag than normal. You could probably give 20 a try first, then lower it from there if needed.