I have checked all the materials and only one material was set with 2048x2048 texture preview size. I will send you the scene by PM.stefano-dear wrote: How big your texture preview size? Try to use default size and please share your scene with me if possible
Thanks
Stefano[/quote]
Your scene needs some optimizations. First I don't see any problems like repeatedly producing the previews. They're done once time. Using a lot render instances are stressing the viewport and causing lags on opengl previews. Also, another problem is HDR environment is slowing down your render. Also very dense foliage with scatter object that is slowing down the render also. Alternatively, you can completely disable "opengl previews".
 
                                                                
                            

 
						
