As an addition to the above:
You need to FIRST check what is REALLY the bottleneck. Task Manager and other tools are good. For disk performance, there is specific test software, too.
- out of RAM? If Host is out of RAM everything is very slow, never do that
- is your software disk-performance critical? Never, I mean never today, use a HDD. Run VMs only on SSDs, regular or later technology
- is your 3D acceleration really using your hardware on Host? It might not, if your Host has dual graphics. There are other recent threads here, which tell you how to check and how to manipulate. Just search for graphics performance under Player
- if you use OpenGL, is your Host graphics card working right? I mean, almost none of them are certified to OpenGL and might not be any good. A faulty working (I mean there are many aspects to this, like using multiple graphics levels, which are a must with graphical applications) card, will affect everything. Try without hardware acceleration ... is that even better? Remedy, in short, is better drivers or a better card for OpenGL (the very cheapest ones may not work correctly in OpenGL)
- using all the processing power of the Host is not a good idea. Thus allocation all the cores to the VM might slow down your system. This was already mentioned above.
