1.5.7|Apr 29, 2026
View on Steam↗Spring Cleaning - Patch 1.5.7f1
3/5 Moderate
Paradox Mods receives a major overhaul with parallel downloads and non-blocking UI, alongside the new Historic Building option to prevent unwanted leveling or abandonment.
Key Changes
- 1Paradox Mods overhaul: Parallel downloads and non-blocking UI added
- 2New Historic Building option prevents leveling up or abandonment for selected buildings
- 3Major demand fixes for mixed housing, signature offices, and commercial stock levels
- 4Education system rebalanced to fix elementary school overcrowding and high school underuse
- 5Urban Cycling Initiative policy buffed from 20% to 50% bicycle usage
- 6New in-game Benchmark tool for performance testing
- 7UI toolbar scaling and transparency settings added
- 8Dog population reduced to improve household performance and realism
- 9Fixed public transport vehicles getting stuck in permanent boarding states
- 10Performance optimization: Disabled unnecessary light/shadow casting during day/night cycles
All Changes
🛠️Modding(8)
- changeParadox Mods: Updated Paradox SDK to version 2.1.2 and Paradox Mods UI to version 2.0.4, requiring script-mod creators to recompile for compatibility.
- newParadox Mods: Added support for parallel mod downloads, allowing up to 3 mods to download simultaneously.
- changeParadox Mods: Mod downloads are no longer blocking; players can browse, subscribe, and manage playsets while downloads occur in the background.
- changeParadox Mods: Removed the 'Beta' label from the Paradox Mods platform.
- newParadox Mods: Added support for Playset Sharing.
- fixParadox Mods: Improved download percentage tracking to prevent progress from getting stuck near completion.
- changeParadox Mods: A thumbnail is now required for publishing a mod, with a new thumbnail field added to the asset upload panel.
- fixParadox Mods: Fixed map upload preview images not displaying the correct thumbnail during publishing.
✨New Features(4)
- newHistoric Building-option: Added Historic Building option which prevents selected buildings from leveling up or being abandoned.
- newBenchmark: Introduced an in-game performance testing tool (Benchmark) accessible from the main menu, including a -benchmark launch parameter.
- newUI: Added a Universal mod-button to the main UI for unified mod access.
- newEncyclopedia: Added new Encyclopedia chapters for Building Customization and Road Zones.
⚙️Gameplay Systems(15)
- fixDemand: Fixed mixed housing causing commercial and medium-density residential demand to stay permanently low.
- fixDemand: Fixed signature offices being incorrectly treated as available for sale, which suppressed office demand.
- changeEducation: Balanced the Education system to align elementary and high school demand, reducing elementary school overcrowding.
- buffUrban Cycling Initiative policy: Urban Cycling Initiative policy now increases bicycle usage from 20% to 50%.
- nerfDogs: Reduced the overall dog population by adjusting household pet limits and spawn probabilities.
- changeTraffic: Stopped citizens from moving in and out via taxis to reduce move-in traffic congestion.
- fixCommercial Demand: Fixed commercial demand being killed by buildings receiving no customers; demand is now based on average stock levels.
- fixOffice Demand: Fixed office demand using incorrect data and removed a multiplier workaround that caused excessive Software company spawns.
- fixPublic Transport: Fixed buses and trams getting stuck in a permanent boarding state at busy stops.
- fixBuildings: Fixed an issue where building upgrades could stall and fail to progress level indicators.
- fixRoads: Fixed outside connections failing to work with non-highway roads.
- fixCrime: Reduced cases where citizens get stuck during robberies.
- fixEducation: Fixed students only participating in leisure activities during study time.
- fixMail: Fixed port mail transfer pathfinding.
- fixOffices: Fixed an issue where some offices could stop producing or trading.
🖥️UI & UX(8)
- newUI: Added options to adjust UI toolbar scaling and background transparency.
- fixUI: Fixed demand bars failing to visually fill up.
- fixEncyclopedia: Fixed game crash when typing CJK characters in the Encyclopedia search field.
- fixUI: Fixed service building upgrades section not being interactable when using a controller.
- newEncyclopedia: Added tooltips to the Encyclopedia.
- fixPhoto Mode: Fixed Photo Mode visual settings not matching game rendering.
- changeAchievements: Updated base game and Bridges & Ports achievement icons.
- fixEditor: Fixed a UI crash in the Editor when the Move Selected key was unbound.
🎨Visuals & Performance(5)
- fixPerformance: Disabled moon light/shadows during the day and daylight/shadows during the night to improve performance.
- changePerformance: Limited main menu FPS to 120 to reduce GPU stress.
- changeVisuals: Improved wind transitions for vegetation LOD changes for smoother tree movement.
- buffIceflake Arena: Added additional parking slots to the Iceflake Arena (requires rebuilding existing arenas).
- fixIceflake Arena: Adjusted LOD transition distance for Iceflake Arena on Low and Medium settings to prevent premature visual downgrades.
🚢Bridges & Ports(1)
- fixBridges & Ports DLC: Fixed commercial and industrial buildings failing to use DLC ports for importing goods.
Summary
The 'Spring Cleaning' update (v1.5.7f1) focuses on systemic improvements to modding, economy, and city management. The headline feature is a significant upgrade to the Paradox Mods platform, enabling parallel downloads and allowing players to browse mods while downloads progress in the background. Gameplay sees critical fixes for broken demand bars, education imbalances, and traffic issues caused by excessive taxi move-ins and dog populations. Additionally, the new Historic Building toggle gives Mayors more control over their city's aesthetic by locking specific buildings in place.