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Regarding the topic at hand, I'd like to add:
In my recent (though few) games, I've also experienced severe lag, and the cursor is as responsive as a drunk elephant, which is especially annoying when the timer is running low :smile51:
This issue doesn't occur at the beginning of the game, but specifically when the timer is nearing its end!
I was planning to try upgrading my graphics card to fix it.
Another possibility is that the new HD mod is interacting poorly with Transylvania -- even after disabling my own Transylvania mods, the mouse behavior didn't improve.
It's likely that this can be fixed by reloading the game after restarting Heroes, but I didn't bother to check -- the games were against live opponents.... In short, this issue requires further investigation.
Let's hear from those who have also experienced lag -- was Transylvania active at the time, or not?
The latest hypothesis is that this happens due to poor interaction between the HD mod's System.ReduceCpuUsage tweak and modern mice with a high polling rate. Owners of such mice are advised to disable this tweak in the launcher (although in HD RC9, it should be disabled by default).