I have a test project where I'm having ~900 entities and noticed a few performance issues. Not sure if all of them can be fixed, but I'll list them out here.
Related: #8

• Opening the "Entities" makes the tool freeze for a few seconds
• Clicking on an entity/attribute/"new entity" in the entities tab makes the tool freeze for a few seconds
• If the room has an entity layer, clicking on an entity/placing one/selecting one makes the tool freeze for a few seconds (can probably for most cases be worked around by just splitting into multiple entity layers and allowing only certain tags)

For context, yes, I need all of the 900 entities for the project.
Also specs:
CPU: Ryzen 1600AF
GPU: RX 570
RAM: 16GB
OS: Arch Linux
Version: 1.26 preview

"Try to use best GPU" is enabled in the settings.