Could you say what numbers you’re seeing more specifically? Unless you have directly chosen to compress the model, there is no decompression. Compression will decrease file size but increase both loading time and memory usage… So I’m not quite sure which thing are trying to improve.
Just to pick the first example at hand, here’s the Samba Dancing.fbx file in the three.js examples folder:
| file | filesize | parse time |
|---|---|---|
| FBX | 3.7 MB | 900ms |
| glTF | 2.8 MB | 50ms |
| glTF + Draco | 600 KB | 750ms |
In all three cases the model loads and animates correctly. I have not included file download in the measurement of parsing time.