The -allow lowcpu flag is provided at CLI level because it's probably the most common setting we use while botting and the whole point of using CLI is starting a lot faster (support for goldfarming). It has the same effect as the lowcpu checkbox in your settings but access to it is provided from outside the client.
-allow lowresource will disable things like debuggers, script and client paint, the window theme which you cannot modify after the client has been started so this is only possible from CLI.
@@Globbee
If a script is not working in lowresource mode, that has nothing to do with the client or lowresource mode as the only way it can affect scripts is by disabling the paint thread so the onPaint() method is no longer called. If scripters write their script code or their script depends in any way on the paint thread that is just blatantly wrong and you should inform them.