Physics Delta Time Adjuster
🟠 Updated over a year agoThis mod may not work until the author updates it. Check for an update, or see the rollback guide.
⚠️ Install Order · 1 step
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview
📋 About This Mod
Ever used a craft with 300+ parts and used physics time warp and had much lower FPS afterwards? That is caused by a bug with Physics Delta Time increasing and not being restored to its previous state. This is an ancient bug that has never been properly fixed.
This mod overrides that code by inserting a user-adjustable variable that locks the PDT to the user's preference; greatly improving performance when CPU bound!
Unfortunately due to Physics Delta Time being stored in UnityPlayer.dll and not Assembly-CSharp.dll, a Harmony patch is not feasible. Kerbal Community Fixes attempted to fix this when I reported this bug it a few years ago, but the implementation is not functioning. There is only one way I know to patch this...
How to use:
Requires Cheat Engine - When running the Cheat Engine installer make sure to opt-out of the crappy adware by clicking Skip All.
- []Run Cheat Engine, Attach KSP_64.exe (ctrl-p), and open up this Cheat Table.
- []Click the box to activate in the 'Active' section. A red X should appear; see screenshot for reference.
- Disabling the script will safely restore the game's code to its original state.
How it works:
- Kerbal's Physics Delta Time calculation is stored in UnityPlayer.dll movss ,xmm2. When using physics time warp, the game will increase the Physics Delta Time but it will not restore to its original state; causing a permanent FPS drop unless the player quits to main menu and manually lowers the PDT in options
- By searching for the array of bytes (F3 0F 11 91 00 01 00 00) CheatEngine will find the PDT address and inject a user adjustable variable directly above the movss ,xmm2 where it inserts the PDT value overriding the game's buggy code.
- When deactivating the script, the code will be safely restored to its original state.
Physics Delta Time Adjuster is a utility mod for Kerbal Space Program that fixes a long-standing bug where physics time warp permanently increases Physics Delta Time, causing FPS drops on craft with 300+ parts. It uses a Cheat Engine table to inject a user-adjustable variable, locking PDT to a preferred value and improving CPU-bound performance.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Addresses a specific, long-standing bug that affects performance with large craft.
- Provides a user-adjustable variable for fine control over Physics Delta Time.
- Actively maintained with a recent update on 2025-06-15.
⚠️ Cons
- Requires external software (Cheat Engine) and manual setup, which may be complex for some users.
- No endorsements yet, indicating limited community validation.
- Only 50 downloads, so the mod is relatively untested by the community.
This mod is for Kerbal Space Program players who frequently use physics time warp with large, part-heavy craft and experience FPS drops due to the PDT bug. It is also for users comfortable with Cheat Engine and manual configuration. Players who prefer simple, automated mods or are not experiencing this issue may want to skip it.
💡 Beginner Tips
- When installing Cheat Engine, opt out of any bundled adware by clicking 'Skip All'.
- Attach Cheat Engine to KSP_64.exe using Ctrl+P before opening the cheat table.
- Activate the script by clicking the box in the 'Active' section; a red X indicates it's working.
📊 Mod Details
- Game
- KSP Mods
- Author
- ShadowedWilds
- Version
- 0.01
- Downloads
- 50
- Endorsements
- 0
- Category
- Utilities
- Created
- 6/15/2025
- Updated
- 6/15/2025
🔧 How to Install KSP Mods
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