How to change Shaders/Materials such that my performance gets a boost + Outlines

So i have a GLB file for which looks like this

I have noticed that many online modelling tools like sketchup web etc use some technique to make the objects look something like this.

This i believe is done for 2 reason.
1.) The Outlines might be because of an un-modelled GLB might be clear in terms of mesh visualisation (could happens through post processing)

2.) this improves performance of webGL rendered for normal devices without GPU

I want to achieve a similar output but the problem is i am using WEBGPU which doesn’t really go hand in hand with post-process

P.S. I have noticed 1 thing that in online modelling tools the outline is not dynamic, compared to post-process effect which is causing sometimes the edge to disappear if we rotate the camera.

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