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This concerns loading time in KSP1, especially the time taken to launch from the VAB or SPH. For quite some time, I've been complaining that the more active vessels you have in a KSP1 save, the slower loading gets. This may be true in a small way, but not nearly to the extent I thought. Rather, a different issue is primarily to blame: single bugged vessels. Let me tell you what I've experienced. I began playing KSP with a single sandbox save called Silica Cubicle. (Please excuse the pun.) I kept my early experiments if they had enough delta-V to go places. I started building refueling infrastructure with mining ships, tankers, and a couple of space stations. I launched relays and exploration vessels. I developed spaceplanes. By the time I had 30 vessels in flight, launching from the SPH got so slow as to hinder development. I started a new sandbox game, Test Bin, just for development. Fast-forward a couple of years. I installed KSP on a different computer and copied my old save games. Eventually, I found launching in Test Bin to be very slow. This was strange because Test Bin only had 3 active flights. I deleted just 1 ship and found launching from the VAB to be as fast as a new game! Then I noticed launching from the VAB was fast in Silica Cubicle too, and remembered I'd deleted some early experimental probes. The ship deleted from Test Bin was nothing special. It only had 36 parts. The other two vessels were larger; a big relay drone with 87 parts and a spaceplane with 53 parts. The probes deleted from Silica Cubicle had only 25 parts. The problem vessels have something in common: octagonal struts (both kinds), connected node to node. The Test Bin ship had 2 runs of 6 octagonal struts. The 3 Silica Cubicle probes each had a run of 3 cubic octagonal struts with strut connectors bracing them. I hypothesize that if we avoid using either kind of octagonal strut in KSP1, our games will load much faster. The uniqueness of octagonal struts Octagonal struts (both kinds) are unique in being structural pieces with no autostrut option, indicating they behave unusually in the physics engine. (If there are other parts like this, I'd appreciate corrections.) I wonder if runs of them are treated as a single part. If so, loading them would requiring extra computation to determine if they're offset or rotated. Perhaps this code is slow. It's worth noting that octagonal struts are also problematic in KSP2 which aims for fast loading times. Optimizing code can introduce some very difficult bugs.

Something happened last week. After the patch, I was getting very good performance. Then, one day when that epilepsy warning came out, it takes forever to get loaded and my performance is down to 17 fps. Tried a reinstall from Steam, but same old. I am unmodded and have not had serious performance issues up until this point. What happened?

Me too, I have mods but I have the same problem in the stock too.

Ok so I'm running 1.4.2 with a bunch of mods and the game loads ridiculously slow. I started a load, went out to dinner for a couple of hours, and came back with game still loading with minimal progress. Mods listed below and there are a bunch but I've done loads twice the size in 1.3.1 with load times of a few minutes. My PC resources are nowhere near pegging out and the app itself responds spot tingly to window moves and such. Any similar problems in the community? Any advice? Thanks in advance. cybermeister KSP: 1.4.2 (Win64) - Unity: 2017.1.3p1 - OS: Windows 10 (10.0.0) 64bit 000_AT_Utils - 1.5.1 Filter Extensions - 3.2.1 TexturesUnlimited - 1.1.0.12 Toolbar - 1.7.17.5 UI Core - 1.0.1 ToolbarControl - 0.1.5.9 Zero-Point Inline Fairings - 1.0.2 ABCors - 0.5 Adjustable Mod Panel - 1.4 AtmosphereAutopilot - 1.5.10 B9 Animation Modules - 1.1 B9 Part Switch - 2.2.1 B9 Aerospace - 6.4 B9 Aerospace - 6.4 B9 Aerospace HX Parts - 6.4 B9 Aerospace Procedural Parts - 0.50 BD Animation Modules - 0.6.5.3 CritterCrawlerRetractingVectoringEngines - 1.3.3.1 Better Science Labs Continued - 0.1.9.3 CactEye Telescopes - 1.3.1.14 Camera Focus Changer - 1.0.4 CameraTools - 1.10 ClickThroughBlocker - 0.1.6.1 Community Trait Icons - 1.0 Contract Configurator - 1.24.4 StructuralTubingRestructured - 1.0.7 DMagic Orbital Science - 1.3.0.12 EVA Transfer - 1.0.8.1 Ferram Aerospace Research - 0.15.9.1 Firespitter - 7.9 Flexible Docking - 1.0.6 GPOSpeedFuelPump - 1.8.12 HullcamVDSContinued - 0.1.9 Impact - 1.6.3.2 ImprovedChaseCamera - 1.6.2 Interstellar Fuel Switch - 2.13.1 JanitorsCloset - 0.3.4 JSIAdvTransparentPods - 0.1.16 RasterPropMonitor - 0.30 Kerbal Attachment System - 0.6.4 Camera Mode Persistence - 1.0.4 Kerbal Engineer Redux - 1.1.3 Kerbal Joint Reinforcement - 3.3.3 Feline Utility Rover - 1.2.4 KerbNet Controller - 1.0.4 Stork - 0.2.6 Kerbal Inventory System - 1.10.6640.40620 KSP-AVC Plugin - 1.2.0.1 KSPDev LogConsole - 0.17.40068.6640 KSPLogger - 0.4.6 KSP Logitech RGB Control - 1.1 KSPWheel - 0.11.8.26 Kube - 0.0.5 Kurrikane - 1.1.0.3 LCA_Project - 0.1.2 Lithobrake Exploration Technologies - 0.4 LLL-Continued - 1.0.2 Infernal Robots - 2.0.14 Maeneuver Node Evolved - 1.0.4 Kerbal Dust Experiment - 1.11.1.8 Modular Rocket Systems - 1.13.2 ModularFlightIntegrator - 1.2.5 ZZZRadioTelescope - 1.0.2.1 NearFutureProps - 0.3.1 NE-KEES - 0.3.5.16 NE-Kemini - 0.2.5.16 NE-KLS - 0.2.5.16 NE-MPP - 0.2.5.16 NE-Common - 0.2.5.16 NE-OMS - 0.7.5.16 NovaPunch Continued - 0.1.4.4 Overdrive - 1.1 PanzerLabs AreoSpace K-Sat Series - 1.1.1 PAPIPluginContinued - 0.4.8 Part Angle Display - 0.3.3.3 PartCommanderContinued - 1.1.3.3 PartWizardContinued - 1.3.7 PatchManager - 0.0.15 PAWS - 1.1.0.1 QuickExit - 2.1.3 Recovery Controller - 0.0.2 IONRCS - 0.1.8 ResearchBodies - 1.9.7 RLA_Recontinued - 14.1 US and Soviet Solar Panels Pack - 1.5 SETI-ProbeParts - 1.3.0.2 SETI-RebalanceMaterialsGoo - 1.3 SettingsMaster - 0.0.2.2 Simple Adjustable Fairings - Plugin - 1.0.1 Simple Adjustable Fairings - KW Rocketry Pack - 1.0.1 Simple Construction - 3.4.6 Extraplanetary Launchpads - 5.9 SolverEngines - 3.6 RecycledParts - 0.1.4.6 Spacetux - 0.3.12.3 MicroSat - 0.1.1 StageRecovery - 1.8 StationKeeping - 0.2.0.1 StationScienceContinued - 2.4.1 TAC Fuel Balancer - 2.17 Cargo Transportation Solutions - 0.5.3 TarsierSpaceTechnology - 7.3 TextureReplacerReplaced - 0.5.4 ThrottleControlledAvionics - 3.5.1 ToadicusToolsContinued - 0.22.2 Tracking Station Evolved - 1.0.3 Trajectories - 2.2 TweakableEverything - 0.1.23 TweakScale - 2.3.10 UbioWeldingLtd-Continued - 2.5.3 Undockinator - 0.6 Unmanned before Manned - 1.3.0.2 UpgradesGUI - 1.5 Waypoint Manager - 2.7.2 World Stabilizer - 0.9.1 ZeroMiniAVC - 1.0.5