Loading time analyzer (updated)
The Load Time Analyzer measures the time it takes for a mod to install when the game starts. Universal plug-in for 1.10.163/AE/VR
About this mod Machine translation
The Load Time Analyzer measures the time it takes for a mod to install when the game starts. Universal plug-in for 1.10.163/AE/VR
Original address:
Prefix:
Fallout 4 Script Extender (F4SE)：
Fallout 4 Script Extender VR (F4SEVR) (if using the VR version of the game):
Updated to version 1.8.1 on September 14th
Updated on June 19th:
Version 1.8
- Added support for the latest version
Updated on April 15th:
Version 1.7
- Fixed an issue where report files were not generated in some settings
- Added watchdog thread for log hangup plug-in
Update April 2:
Version 1.6
- Added F4SE initialization range metric (first → last RegisterListener timestamp)
- Added _ReturnAddress() capture to better identify RegisterListener
- Added anti-overlap clamping for Perfetto JSON ESP events
- Removed [! ]/[!!] Warning/crit flags in reports
Version 1.5
- Added NG support
- Fix report never generated when plugin registers empty sender listener
This is a ported version of the Skyrim module Load Time Profiler developed by QTR-Modding, which analyzes your Fallout 4 startup to identify which modules load the slowest. It measures the F4SE plug-in's DLL loading time, message callback duration, and single ESP/ESM file processing time, and exports detailed reports to CSV, TXT, and Perfetto JSON to facilitate your troubleshooting of slow startup issues.
How to use
Install and start the game normally
Wait for the main menu to appear
Reports are automatically generated before the main menu is opened
Save the report to:
FO4: Documents\My Games\Fallout 4\F4SE\F4 Load Time Analyzer\
FO4 VR: Documents\My Games\Fallout 4VR\F4SE\F4 Load Time Analyzer\
Detailed logs are also written to the F4SE log directory as F4LoadTimeProfiler.log.
source code
GitHub — GPL-3.0 license.
Install & use Install: follow the bundled instructions
- Unzip the archive from playbuff and read the bundled readme / instructions first.
- There is no universal mod manager for this game: some mods replace game files directly, some go into a game-specific Mods folder, and some need a game-specific community loader or tool first — follow the bundled readme.
- Place the files exactly as the readme says; mods with listed dependencies need those installed too.
- Launch the game to confirm it loaded; some games require enabling mods in settings or an in-game mod menu.
Install locations vary a lot between games and mods — the bundled readme is the most reliable guide.