Hi Enrico,
I’m afraid I’m not seeing the same issues you have reported.
I’ve setup a simple test scene with a cube mesh that has 1000 fractures. I’ve used the level BP to apply radial damage to my destructible. I’ve set the Base Damage and Damage Radius to 50.
I’ve set this all up to be on key press. I start my level and press the key to apply the damage to fracture my mesh.
In 4.8 I’ve got the same setup when compared to 4.7. I’m actually seeing slightly better performance in 4.8 than 4.7 and I’m not experiencing any lag that has been described. This can change from system to system since DMs are handled on the CPU and not the GPU. Also, using DMs with excessive amounts of fractures is not recommended. Unless you change the hard coded values, there can only be 2000 fracture chunks in a scene at a given time.
If you have a sample project you want to upload I can have a look as time permits, but I’m not seeing a regression in performance from my test setup.
Thank you!
Tim