that’s the whole point of the program
if you don’t need that and only batch export stuff please use https://github.com/FabianFG/CUE4Parse

I don't understand, how would adding an option/toggle that could speed mass export -which is available in Fmodel- defeat the whole point of the program, it'd simply speed the export for people who want to? and don't want to use a library instead of a GUI

disabling the json preview will not speed up the export
most of the time is spent building the mesh to export and saving textures in materials

if you want it to be faster use the UEFormat model export format and disable "Save Materials Embedded within Meshes"

something is actually wrong with it like I said, it doesn't seem to be the preview, but when exporting a big enough number of objects it slows to a halt almost, I've a 14700k cpu, & 32GB of ram, so it's not the pc, steps to consistently reproduce on my end:

for the slow down:
1-valorant-> load all -> folders (shooter, content, equippables, and export the animations of a large subfolder, for example melee or AK, after a while the export will slow down so much, & if you clear the log it starts going at normal seed again.

for crash:
1- same thing but export the animation of the equippables bomb folder, always causes a crash on my end

this has been fixed in the latest QA Testing update but please reconsider your workflow.

FModel doesn't have a scan feature yet, so atm, you're asking FModel to parse nearly 90k packages for only ~6k animations. By parsing all these useless packages FModel will encounter broken ones that will cause a hard crash. There's nothing we can do about it, we don't own the data we parse.

Valorant is well made and use a comprehensive folder structure, use it to your advantage and bulk export stuff via the search window (update to QA first).
If you blindly need everything, again, please use https://github.com/FabianFG/CUE4Parse