Mass Matters
Community Rating
MAJOR OVERHAUL! If updating from the previous version, please set all options to off, fully delete, and reinstall!
Mass Matters: The more/less you carry and the stronger/weaker the current gravity combine to affect how fast you move — and now more.
Speed is a Spectrum: 1G and 50% Mass defaults you to 100% speed, anything below that will gradually make you move FASTER, and anything above that will gradually make you move SLOWER.
Heavy Breathing: Burn oxygen based on your burden. Pack light and your actions will use less O2, overpack and actions will use more.
Handle With Care: Being unburdened means quicker reloads, or slower if hindered.
For Every Action: When floating in zero gravity, less mass will have you drift hard with every shot, or vice versa.
Heavy Load: Your ship's maneuverability is based on how full the cargo hold is. Travel light and turn on a dime, or haul up and your engines will feel it. Top speed is unaffected.
Choose Wisely: When overencumbered your will drop straight to the lowest speed (on foot speed only, all other effects continue normally).
Scenic Route: A craftable "Walk Toggle" item is available in the industrial workbench for free. You can hotkey this item and use it to toggle locking yourself to walk only (fastest possible before it triggers the "jog" animation), no running or sprinting. Mainly for controller players who like to travel at an immersive pace.
Individual Options: Extensive options to tailor the gameplay how you prefer. Every system has its own toggle, two dials set how strong the effects can get in either direction, and a "system" toggle which turns everything off cleanly.
Don't Worry: Compatible with everything, even other mods that affect player speed, oxygen, reloading, or ships — every effect stacks cleanly on top. Safe to install or uninstall at any time. Set both settings to 'OFF' before uninstalling to minimize potential issues.
Achievement Friendly version coming soon!
Also Available on Nexus: https://www.nexusmods.com/starfield/mods/16044 Please reply in the comments at nexusmods with any bugs you encounter, these are very helpful. I test thoroughly but I am only one man, and I don't have all the time in the world.
Release notes
PC
-
1.00MAJOR OVERHAUL
-New gameplay systems
-New gameplay options
-Various optimizations -
1.4-Further expanded gameplay options.
-Made the speed readout in the status menu much more reliable.
-Updated for current game version.
-Added PlayStation support. -
1.3Expanded options.
Added current speed readout to player effects. -
1.2.2Fix for broken jump.
Safe to update. -
1.2.1fixes bug that was cancelling out speed changes from other sources (chems/etc).
Safe to update. -
1.2Changed math from multiplicative to average (less extremes but better feel).
Added jump height to calculations.
Removed upper/lower player speed cap for better compatibility.
Overencumbered raised to 50%. -
1.01Numbers altered to account for engine limitation. Set options to "OFF" before updating.
-
1.00Initial Release.
Xbox
-
1.00MAJOR OVERHAUL
-New gameplay systems
-New gameplay options
-Various optimizations -
1.4-Further expanded gameplay options.
-Made the speed readout in the status menu much more reliable.
-Updated for current game version.
-Added PlayStation support. -
1.3Expanded options.
Added current speed readout to player effects. -
1.2.2Fix for broken jump.
Safe to update. -
1.2.1fixes bug that was cancelling out speed changes from other sources (chems/etc).
Safe to update. -
1.2Changed math from multiplicative to average (less extremes but better feel).
Added jump height to calculations.
Removed upper/lower player speed cap for better compatibility.
Overencumbered raised to 50%. -
1.01Numbers altered to account for engine limitation. Set options to "OFF" before updating.
-
1.00Initial Release.
Playstation
-
1.00MAJOR OVERHAUL
-New gameplay systems
-New gameplay options
-Various optimizations -
1.4-Further expanded gameplay options.
-Made the speed readout in the status menu much more reliable.
-Updated for current game version.
-Added PlayStation support.
Additional Screenshots Available
This mod has 3 additional screenshots available on the official Bethesda.net page.
View All Screenshots on Bethesda.netYouTube Videos
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Mod Information
- Published
- Feb 14, 2026
- Last Updated
- Aug 07, 2026
- Platforms
- Playstation, PC, Xbox
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