Issue
Large inventories or build saves begin failing as one player record grows.
Cause
Serialized data includes repeated defaults, verbose field names, raw transforms, or unlimited history.
Fix
Measure encoded size before writing. Remove derived values and defaults, cap history, use compact stable identifiers, and split genuinely independent large collections into versioned records. Do not split atomic balances across keys without a consistency plan.
Verify
Test the largest realistic profile, not an average new player, and leave headroom for future migrations.
Official Roblox DataStore storage update
#1
Original Heliotrope guidance with authoritative Roblox sources.