Launching designer from web vs native launcher

Not sure if this falls into Ignition Problem category, if not pls suggest where should I put this one into.

I’d like to increase maximum memory for designer so I hope that the responsiveness is better when working on a project. I have increased max memory to 768MB in the gateway settings. But in my designer, if I launch from the gateway web, it shows 5xx MB but if I launch it from native launcher, it only shows 2xx MB.

Does anyone know
Why it’s different?
How can I increase?
Which way of launching is preferable?

Thank you

FWIW, the native launcher does have a bug where the Designer memory settings are not passed to the Designer being launched. This has just been fixed, and will be available in the next 7.6.7 RC.