This basic tip can help you sort the performance problem and moreover optimise it to have the system up and running in a smooth manner.

In the bottom right corner of the tool, we can see the memory settings and current memory usage. If this is not visible it can be customized to be seen. 

Do you know that this heap size can be increased and this improves your project performance?  

The default setting used to be 2GB and this maximum heap size can be safely set to half the size of your RAM settings.

Double clicking on where the cursor is kept over, does the garbage collection for you instantly. This comes very handy when you work with larger models.