Quick Answer: If Agent 64 stutters, launch it without Easy Anti-Cheat before changing any setting — three players independently report the stutter disappearing entirely, one of them at a locked 60 FPS, and the developer's own first question was whether it persisted without EAC. The catch: online co-op and Arena require EAC, local split-screen does not. If you crashed in Online Arena, update: the developer shipped five hotfixes on launch day and eventually disabled mid-match joining outright.
Version note: Current for hotfix v1015 (August 11, 2026). Patch contents are quoted from the developer's own Steam announcements; everything else comes from launch-week forum threads, several of which the developer answered directly. Single reports are labelled as such. This game is one day old and the situation is moving quickly.
The Launch-Day Hotfix Timeline
Replicant D6 is a solo developer and shipped four builds plus two status posts within hours of release. What changed:
| Build | Fix |
|---|---|
| v1002 | Crash in multiplayer Arena lobbies when players join an active lobby |
| v1004 | The "borked Castle map" in Arena |
| v1011 | Further attempt at the hotjoin crash; fixed the helicopter tutorial message crashing the game by querying text that did not exist; visual glitch in the Catacombs map |
| v1015 | Hotjoining Arena matches replaced with a queue for the next match, temporarily, while the desync and crash cause is investigated |
If you bounced off the game on launch day because of a crash, the build you played is probably three or four versions old.
Frametime Stutter: Check EAC First
Symptom: the frame counter looks fine — one player reports never dropping below 60 FPS — but the game hitches constantly.
Finding: it tracks with Easy Anti-Cheat. In the stutter thread, the developer's first reply was to ask whether it happened without EAC. Three separate players answered:
- "Nope, not a single stutter without EAC on. That's the fix for now."
- "Also been having the same problem, without EAC works perfectly fine."
- "I'm having the same stuttering issue on my system even with my mouse polling set to 1000hz. With EAC off it has 0 issues. I've tried different framerates and nothing seems to fix it."
What to do: launch the non-EAC option for single-player and local split-screen. Accept EAC for online play, or stay offline until the developer resolves it. This is a workaround players found, not a fix the developer has shipped, and he has not stated a cause.
Mouse polling rate is a separate, smaller factor. The developer had previously pointed at polling rates above 1000 Hz. One player reports gameplay improving after setting polling to 1000 Hz but stutter still present — so try it, but do not expect it to be the whole answer.
One player reports a possible memory leak — performance degrading as they progressed through a level — and the developer replied "I see. I'll be looking into it." The same player later said the slowdowns happened at varying points rather than always worsening, so the leak reading is unconfirmed. Single source, developer aware.
Online Arena Crashes and Desync
Status: actively changing. The original bug crashed players when someone joined an active lobby. After three attempts across launch day, the developer took the direct route in v1015:
"instead of joining matches mid-game, the game will make you queue for the next session instead. This is temporary solution while I find the cause of the live joining bug."
So mid-match joining is gone for now by design, not broken. If your lobby will not let a friend drop in, that is the current intended behaviour.
Two further crash reports exist with no replies yet, both single-source: a Unity error crashing the game during multiplayer Arena, and the EAC-free offline version crashing. The second one matters if you adopted the EAC workaround above — if the non-EAC launch option crashes for you, you are stuck between the two problems and it is worth posting your specs.
EAC, Co-op and What Requires What
Online co-op requires EAC. Local split-screen co-op does not. That answer came from a player in the co-op thread rather than from the developer, but it is consistent with everything else on the board, and one player decided against buying on the strength of it.
Combined with the stutter finding, that produces a clean rule:
- Solo or couch co-op → launch without EAC, get smooth frametimes.
- Online co-op or Arena → EAC required, accept the stutter for now.
One more EAC-adjacent report, single-source and unanswered: a "Please unload msio64.sys before starting the game" message blocking launch. That driver belongs to hardware monitoring and RGB software; if you hit it, close monitoring utilities before launching. Nobody has confirmed which application it came from.
Steam Deck
Players are running the game on Deck, and the reports so far are mixed rather than bad:
- Frame dips from 60 to around 40 FPS, described as intermittent.
- A Deck player getting stutter in single-player with EAC enabled, who then planned to test without it — the same pattern as desktop.
- A texture bug on the Castle level, one report, no replies. Note the developer separately fixed a "borked Castle map" in Arena in v1004, which may or may not be the same asset.
There is no official Deck compatibility rating discussion from the developer as of August 12.
Controller: Working, But Under-Configured
The game ships full controller support including DualShock and DualSense, and this is a game people specifically want to play on a pad. Two gaps are drawing crowds:
No separate aim-mode sensitivity for controller. Ten players in one thread report the same problem: the sensitivity setting applies to mouse, so on a pad general turning is too slow while aim mode is too twitchy. Requests include a separate slider and control over the reticle bounding box before the view starts moving. The developer had not replied as of August 12.
No native N64 controller support. Unsurprising, but this is a GoldenEye homage and people are trying. What the thread established:
- A player published a Steam Input layout for the NSO N64 controller to the community page, mapping A/B to A/B, X and Y to C-Down and C-Left, bumpers to L/R, right trigger to Z-R, left trigger to Z, and both sticks to Joystick Mouse.
- Their key tip: start the level with keyboard and mouse first, then switch to the N64 pad.
- One player reports an NSO N64 controller being recognised as players 2 and 3 simultaneously. Single report, unresolved.
- Real N64 controllers work through third-party adapters, per two players naming specific converters.
Steam Input configs resetting to default has two reports and no answer yet.
Smaller Reports (Single Sources, Not Yet Patterns)
- Next Gadget keymap bug — one report, one reply.
- No LAN mode — confirmed absent by players; online or local split-screen only.
- No simultaneous mouse and gamepad input — a request, not a bug, with no reply.
- The Tower level mask is not missing. A player reported the second level's mask not appearing where the picture showed it, then posted "nvm im blind"; the developer replied cheerfully. Masks are findable collectibles with in-game location hints — if yours seems absent, look again before reporting it.
What Is Coming
The developer has announced a Supporter Edition as an $8 upgrade pack containing a cosmetic Gilded Sparrow G5 and the original soundtrack, noting it could be delayed a few days past launch and that upgrading later costs no extra. He has said he is still investigating the Online Arena hotjoin cause and the reported memory leak. Nothing has been said about the Cypher progression system that dominates the general forum.