Hey guys,
after the hotfix the game runs for me in 50 fps while in battle.
In menu it jumps between 60 fps an beyond that.
I've already tried to install the newest gpu drivers and turned off every background process (including frame limiter), but it didn't help.
I've also tried every sort of graphic setting, but it kept running at 50 fps.
The game is using the dedicated gpu, so that is also not the issue.
Considering that other games like Titanfall 2 run at higher framerates, I don't think it has something to do with my specs.

Specs:
CPU: Amd Ryzen 5 3550H
RAM: 16 GB Dual 2400MHz
GPU: Radeon RX 560X 4 GB

Does anybody know how fix this?

I found solution to my problem.
Apparently the game has problems with multicore, so it has to run with just one CPU core.

So just do following:

1) Right-click on the game's shortcut ("Launch STAR WARS Battlefront" inside the "Star Wars - Battlefront" Directory) and select "Properties".

2) Copy and paste the following in the Target field:
C:\Windows\System32\cmd.exe /C start "" /affinity 1 "C:\GOG Games\Star Wars - Battlefront\GameData\battlefront.exe"

3) (Optional) Use a frame limiter like MSI Afterburner or VSync.