When i launched the game, it was working properly, but after 30 - 40 minutes of game it starts leaping from 60 to 40 fps, firstly some minutes apart, then increasingly.

I've tried:
- change compatibility settings
- widescreen patches
- dgvooddoo
- virtual machine
- change power options
- increase priority of BattleRealms.exe
- combine this methods

and it wasn't solution. I would add, that demo works properly.

Any other ideas?

I find solution. But I must say, that it isn't method for definitely remove lags, but f or reduce them (they still exist, but occur less often and aren't annoying)

To the point:

1. In graphic options you have to enable Scale full screen

2. Launch and exit the game

3. Change Scale full screen on Keep display scalling

4. Launch the game

5. Have fun!

(edit) Albeit it does not work. Dgvoodoo 2 and properly setting's are the best solution. Not ideal, but very good.

List your PC specs. It doesn't seem like the game is at fault despite you saying Demo works perfectly.

Thank you for answer. I solved the problem using dgvoodoo 2 and settings, what I found in post of another user (earlier I haven't used properly settings in dgvoodoo), who has lags too. Now lags are not often and not divest enjoying game.

My PC spec's is Windows 10, Intel Core i3, 2 GHz, 4 GB RAM