Admin panel slow was: Update to GetSimple 3.2.1 slows down admin panel

[shawn_a]

GSNOVERCHECK simply disables the header checking, the health check is unaffected.
3.0 added persistent version checking to show a little icon on the support page and people did not like it especially since it scared paid services users. This is to handle that, and allow it to be disabled. It does not disable auto versions checking of plugins or versions on health check and plugins pages.

Also all api requests are already cached

The issue of plugins checking constantly has already been addressed in 3.2.2 and will only check versioning on plugins page from now on.