Can importing a lot of assets from Blender in the form of meshes cause your game to lag?
It can make your game lag depending on the amount of meshes you’ve imported and depending on if your device can handle high detail things.
Of course it will cause your game to lag, but depending on the device you’re currently using, and the amount of parts added to mesh are a big factor in this.
And it depends on how much poly the mesh has
Depends on how many triangles the mesh have. It’s the same logic as placing bricks. If your game have a lot of bricks, it surely does lag devices.