If I close Battle.net and just have Heroes of the Storm running I get no lag.
Hey, TheDarkArmy! This could be caused by the hardware acceleration since this can take up more resources that the game wants or needs to use. Could you see if disabling the hardware acceleration helps?
- Open the Blizzard Application.
- At the top left, there is a Blizzard Logo. Click here and then Settings.
- In the General tab, scroll down all the way to the bottom.
- Uncheck “Use browser hardware acceleration when available.”
You may also want to check other browsers include Microsoft Edge or Internet Explorer to see if they have the hardware aceeleration active as well.
If the problem continues, in the task manager (press CTRL+SHIFT+ESC), is anything in high usage or spiking? Usually, this should be mostly on network, memory, processor, sometimes the disk usage can spike up to 100%