5E xp is like resting rules, there's no one system we all use in TT. 5E is a unifying system, incorporating different play styles in the same rule set. So when you say you just want 5E implemented, be aware the DMG doesn't present just the one system.
BG3 has waaay more encounters than in a TT game. And frankly the AI goes soft on us compared to a DM. Imagine if after angering the goblins they sought out your camp and sprang ambushes. We're already getting a lot of soft xp. So they award lots of small awards for the series of easy encounters.
I think in my last play through I hit level 3 before 3 hours. That's fast! Levels 3-4 and 4-5 were slow enough to remind me of BG1&2 progression.
