I am really in love with this game, but i have a serious issue with it.

At turn 150/200 (8 empires) the game has a serious lag problem, the fps are high but the game just lags and stutter, it becomes unplayable.

my specs: gtx 960m intelcorei7 2,6ghz

Please help, i really want to play this game more!

Can you please provide some more info about your system, as described here: https://www.games2gether.com/endless-legend/forum/22-gameplay-and-ai-issues/thread/6548-read-first-reporting-an-issue ?

A savegame file with lots of stuttering would also help a lot.

Finally, when the game stutters a lot, can you ALT-TAB and check CPU usage / memory usage / GPU usage ?