I'd guess that json is the least of their problems. Even with the fix, load time is still an unreasonable 2 minutes. This suggests they aren't doing any of the

I'd guess that json is the least of their problems. Even with the fix, load time is still an unreasonable 2 minutes. This suggests they aren't doing any of the load performance things game devs have figured out over the decades, like streaming loaders and stacked memory pools.