Castlevania Belmont's Curse Performance: Demo FPS and Settings Fixes

Change settings before you touch hardware. The most-quoted "45 fps dips" report in the Belmont's Curse demo is a Steam Deck post, not a desktop-wide bug, and the single change that fixes it for some players is dropping the monitor refresh rate — a free, reversible setting. Start there, work down the list, and only then start swapping parts.

Everything below is based on the free demo as of 2026-10-05. Konami has published no patch notes, no known-issues list, and no performance roadmap, so every fix here is a player report with no official confirmation behind it.

What the 45 fps reports actually are

The sentence everyone is repeating — "very frequent dips to 45 fps" — is one Steam user, posted on 1 October after playing the demo to its end, whose conclusion was to wait for a patch before buying the full game. The same post says the game was "locked at 1080 by 720," which is the Deck's stock output, and adds that even when 60 fps held there were stutters that were "not screen tearing."

The fix order: settings first, hardware last

Work top to bottom. Every step costs nothing and takes under a minute.

Steps 2 to 4 come from the launch-day thread about the demo failing to start at all, not from a thread about frame rate. Worth trying anyway, since the same display-mode negotiation appears to be involved in both — but nobody has posted a controlled test linking them to dips specifically.

If the game will not open at all, or opens to a black window, that is a different problem with its own working set of fixes — the black screen troubleshooting guide covers the PLAYERPREFS.sav route and the quit-and-relaunch loop.

The "Limited FPS" setting, and why nobody can tell you the option list

The in-game frame rate control is named Limited FPS, and at least one of its options is spelled "Unlimted" — missing an "i". Both details come from a player editing a post in the launch-day thread, and they are the entire extent of what has been publicly documented about this menu.

If you want the published frame rate targets rather than the menu's internal values, they are on Konami's own product page: 60 fps on PS5, Xbox Series X|S and PC, and a locked 30 fps on Nintendo Switch.

Official source: Castlevania: Belmont's Curse official site — "Frame Rate 60 fps (Nintendo Switch: 30 fps)."

If you have the demo in front of you, read the option values off your own screen rather than trusting any list published online — including this one. Nobody has posted a screenshot of the full menu.

The 720p / 1080p resolution cap

A Nintendo Life commenter playing the PC demo on launch day reported that the only resolution choices offered were 720p and 1080p, and concluded the game was limited there "at least for the demo." That is the entire public record of the PC resolution menu, and two more complaints point the same direction from different machines:

• Steam Deck — "locked at 1080 by 720" with unreadable icons, per the Steam Deck thread.
• Linux — a Steam thread titled 244hz doesn't work for me (Linux) - also ultrawide screen support?, whose one reply recommends switching to windowed fullscreen and pressing Alt+Enter twice to force the current desktop resolution.

Konami lists only Windows on Steam, so a Linux player is running this through a compatibility layer rather than a native build. That is worth keeping in mind before treating a Linux-specific display problem as a game bug.

On Switch, the picture quality complaint is a different one again: multiple Nintendo Life commenters describe the Switch 2 running the Switch version at about 60 fps but looking soft, with one noting the image is "either blurry or at a lower resolution, especially when a character is zoomed in." The Switch 2 version page covers whether a native build is coming, which Konami has not announced.

If you are deciding whether your machine is even up to the task, the PC system requirements page covers what Konami has and has not published.

The jump "stutter" is a separate argument, not a frame rate problem

The largest performance thread on the demo is titled Jumping feels... bad., and it splits cleanly into three camps that are not talking about the same phenomenon.

Camp one — it is a rendering or perception artifact. One reply spells the mechanism out: Rose loses horizontal speed when she jumps, so the background slows to her new speed and speeds back up when she runs again. That is why it shows up while bunny-hopping across a room, and why it looks like a frame drop without being one.

Camp two — it is a mechanical design choice. Multiple users say the jump itself is the problem and that no setting changes it.

Camp three — machine-dependent. The fixes live in the same thread: one user wrote "Try lowering the refresh rate. Fixed most stuttering issues for me," while another answered a "what are your settings?" question with "the gameplay itself felt butter smooth for me. Played at 120 fps, V-sync off."

That third camp is the useful one. Two players, same build, opposite experiences, and the difference between them is exactly the variable you can change in under a minute. Do the refresh-rate test before deciding which camp you are in.

The Deck report is the most specific performance evidence in the demo, and it is negative. If you own one, the Steam Deck settings guide sets out what is known rather than promising a verdict pre-release testing cannot support.

What has not been fixed or announced

Konami publishes the demo as the opening chapter of a game due 15 October 2026, and its save transfers to the full version on the same platform and account — so tuning settings in the demo and losing that save is a bad trade. The save transfer rules spell out how to avoid it, and the demo guide covers what the demo contains and how long it runs.

FAQ

Is there a confirmed FPS bug in the Belmont's Curse demo? No. No official source has acknowledged one. The widely quoted 45 fps dip is a single Steam Deck report from 1 October 2026.

Does the demo run at 60 fps on PC? Konami lists a 60 fps target for the PC, PS5 and Xbox Series X|S versions, and a locked 30 fps for Nintendo Switch. Target is not the same as a measured result, and no measured benchmark has been published.

What does "Limited FPS" mean? It is the in-game frame rate setting's actual name. An uncapped option in it is misspelled "Unlimted". The specific frame values in that menu have not been documented publicly.

Why does the resolution only go up to 1080p? One PC player reported only 720p and 1080p were selectable in the demo. No official explanation has been given.

Will lowering my refresh rate actually help? It is the cheapest thing to try and the only fix with multiple confirmations across two threads. It is not universal — one player in the launch-day thread changed refresh rate and reported no difference.

Is the jump stutter a performance problem? Unresolved. Players split between a rendering artifact caused by horizontal speed loss on jump, a deliberate mechanical choice, and machine-dependent settings. Changing your refresh rate is how you find out which one you are looking at.

Does any of this carry over to the full game? Unknown. Performance behaviour in the full game has not been measured, and no patch notes exist for the demo either.