CBlogin hight memory usage

In both cases, the effect is the same. 6Mb uses.

Oh, and more. If in module settings I set "CB Plugins integration" - "Yes" when yes, memory usege up to 10mb.

In any case, no manipulation of the settings and plugins have no effect.

6 MB for CB and 4 MB for CB plugins is perfectly within the scope of Community Builder + CB plugins. Unfortunately PHP is quite innefficient in its memory use. Even a simple string takes way more than a byte per character as it theoretically should...

and CB is not a small extension

Most hosters don't use the default 16 MB of PHP, but offer 20 or 32 MB standard.