THE SHORT ANSWER
Roblox version 743 delivers under-the-hood fixes: instance streaming frame spikes are reduced, Server Authority now runs in parallel code, and avatar jitter when using server-authoritative rigs is resolved. ResampleMode and text-chat ban bugs remain open.
- Instance streaming frame-rate instability and spikes addressed
- Server Authority can now be used inside parallel Luau code paths
- Avatar shaking bug fixed when switching back to server-authoritative rigs
- ResampleMode property still absent; developers waiting for next updates
- Text chat service ban bug complaints persist without official response
What shipped in 743
Roblox's 743 release arrived on 15 October with no formal changelog in the announcement post — just a Dolly Parton birthday nod — but developers quickly surfaced the real changes in the forum thread. The most impactful items center on performance and parallel execution.
Instance streaming frame spikes reduced
Long-standing complaints about frame-rate instability when instance streaming loads chunks have been addressed. One developer called it "one of my biggest qualms with instance streaming" and confirmed improvements are still being added. No exact numbers were shared, but the consensus is smoother frame times during streaming transitions.
Server Authority enters parallel Luau
A highly requested change landed: Server Authority — the system that lets the server own physics and movement for networked assemblies — can now run inside parallel code. Previously the feature was too expensive for heavy use because it ran on the main thread. Moving it to parallel workers "cheapens it a bit," according to one engineer, and opens the door for larger-scale server-authoritative gameplay without tanking frame budget.
Avatar shake bug resolved
Developers who had switched to faking a local rig to avoid avatar jitter report the shake is gone when using standard server-authoritative rigs again. The fix appears tied to the same Server Authority updates, though Roblox hasn't published a detailed breakdown.
Outstanding issues
- ResampleMode: Still missing after not appearing in 742; developers expect it within the next few releases.
- Text chat service ban bug: Multiple complaints in the thread, no acknowledgment from staff.
- Studio version rollback: At least one developer noted inability to run older Studio builds for regression testing.
What's unclear
Roblox has not published official metrics for the streaming improvements, nor a full list of API changes. The 2-3× performance figures mentioned in discussion appear to be internal estimates for planned work, not shipped numbers. Expect a more detailed breakdown in the next developer update or release notes post.