Hello.
The speed always depends on particular HW / SW configuration. However, can you clarify what exactly you mean by ""too slow?" What operation you refer to and how long does it take? Please note, first load (compilation) always takes longer. Once it is compiled and cached, it should be faster.
As for folders, instead of deleting particular folder after the installation, it is better to choose
Custom installation and choose what parts you wish not to be installed.
Best Regards,
Radek Macalik