editor never crashed, memory leak happened many time (more than 20) and i had to kill the process to close it faster, even i can close the editor the normal way but it took longer as it run slow as hell
and as neutronux posted below, i never experienced memory leak with my project in 4.8, and now it happen often on 4.9 in 3 different project
you can find my dxdiag in the file attached to this comment