>> Click the Standard small button on.
Have a look at the Preferences> menu. There is a fair amount of submenus in here that can have a significant effect on your workflow in Zbrush.
Be careful not to fiddle around with things that you do not understand in this menu. Various submenus have memory and performance options that can potentially crash your machine.
>> Open out the Preferences> menu by positioning the cursor over the Preferences> menu tab.
Most menus and panels have expandable submenus. These submenus look like titles with small orange circles next to them. To expand or contract a submenu, click on its’ title within a menu.

>> Expand the Preferences>Misc> submenu and choose the button titled SkipWelcomeScreen.
>> Next, expand the Preferences>Performance> submenu and choose TestMultithreading. Select Initialize and Continue.

Multi-threading is likely to be recommended on a high-end machine.
>> If multithreading is recommended then turn on the MultiDraw and MultiRender buttons.
By using multithreading, the machine you are using will calculate faster, by more efficiently using the multi-processors.
The Preferences>Performance> submenu is a risky one to ‘play’ with. Only change these options if multithreading is recommended.
There is a Preferences>ImportExport> submenu which is used mainly when importing and exporting geometry from (or to) other 3D applications.