Thank you @mawa. I conducted some tests, and it appears that the default sample value being 1 can explain this issue. If the sample value is not increased to a number larger than one, there is no difference compared to turning off antialiasing.
- Antialiasing disabled, framerate 20, link to Playground #12
- Antialiasing enabled, samples 1, framerate 20, link to Playground #10
- Antialiasing enabled, samples 4, framerate 8, link to Playground #11
I was trying to determine the performance gap between Babylon.js Gaussian Splatting and PlayCanvas (this thread). By asking this question, I was doubting if there was some sort of antialiasing that I had not turned off, causing a drag on performance.
Problem solved now. Thank you!