Yeah, it isnt, for sure, but read this, what happenned to me yesterday.
After 10th attempt to make a hair particles for grass,(because of blender crashes and blender was lagging for about 7fps - lots of particles) i saved the work, I converted it to meshes(via modifiers)-it took for 10 minutes, so I decided to join them to a one mesh, so CTRl+J - I was painting about 2 minutes to only show little mindow with question “Join this meshes?” SO I selected “YES” after 15 minutes of converting them, I startedd to render via yafaray, it took about 5 minutes to initialize, but what happened?? CRASH. So I loaded las save (saved before joining them) but loading that blend file took about 10minutes ,it wriitten “Blender Error:see console” there was(in that console) plane 9700-plane9999 was not found, I ignored it and attemped to join them again, After 15 minutes of waiting for joining, the SHIT was joined, nothing happended, so I decided to render them without joining them, so I hitted that biig button named “RENDER”, Scene was rendered fully excepting grass, so final result of 10hours of creating particles (i finished at 22:30) was “NO RESULT”, I almost demolished my keyboard, my mom was aggravate coz I had heebie-jebbies fuked out… Fck,Fck,Fck,Fck,Fck