Are DOTA servers lagging?
One of the most common causes of lags during gameplay is the faulty or incompatible graphics driver. If Dota 2 starts lagging after you updated the graphics driver, youll need to roll back the driver to the previous version; if you havent made any changes to the driver, then try updating it to the latest version.
Why does Dota 2 Keep losing FPS?
The Dota 2 FPS drops issue may occur if too many applications or programs are running at the same time. So try restricting applications and downloads in the background before playing the game to see if this issue reappears.