- Version
- 2.5/b32
- Platform
- PS5
**PS5 v2.5 b32 Performance Report: Chunk/Streaming Instability (Repro + In-Game Debug)**
**Summary:** Cities/POIs cause severe memory/streaming thrash even on fresh lvl0/GS0 worlds. Heap pins at 98-100%, MountScope "savedata0" mount/unmount loops, FPS collapses to teens—even standing still after exploration. Not graphics load: Chunk streaming + persistence + PS5 RAM/SSD interaction.
**Observed Debug Data (aiddebug / showchunkdata):**
| Metric | Forest Idle | City/POI Idle | Notes |
|--------|-------------|---------------|-------|
| Chunks | ~225-240 | ~240 | Climbs post-exploration |
| Heap | 97-98% (1822/1873 MB) | 99-100% (1921.7/1921.7 MB) | Creeps → pins → forced cleanup hitch cycle |
| MountScope Loops | 10-15 /5s ("savedata0" unmount/mount) | 12+ /5s | Repeated failures ("ReqBlocks=0 WasCreated=False") |
| Save Spikes | Vehicle/Turret writes (0.05s) | + Terrain Align WRN spam | "Saving 167 chunks took 1005ms" examples |
| FPS | 17-41 | Teens (25.7 → 10-15) | Idle collapse |
**Pattern:** Heap rises (vehicles/turrets/AI ticks) → max → GC hitch → repeat. v2.5 RWG/AI changes + console SSD = regression (pre-2.5 milder).
**Reproduction Steps (Required - Fresh World, 5min Test):**
1. New Game > Advanced Gen: 4km Forest RWG, Max Spawned Zombies=4, Walkers only, No Blood Moons/Storms/Biomes, Performance Mode/View Distance=1/FSR Off.
2. Pause > Options > General > "Open Console Button in Pause Menu" = ON.
3. In-game: Pause > Console > `aiddebug` (toggle ON for spam) + `showchunkdata` (heap/chunks).
4. Forest idle 1min: Screenshot console/FPS (Share > Recent > Edit > FPS overlay).
5. Drive/explore into city/POI, idle 2min: Screenshot again—watch heap climb, FPS tank, MountScope spam.
6. `aiddebug` OFF > `saveworld`.
**Platform:** PS5, v2.5 b32 (post-Jan 26 vehicle hotfix). SP/MP tested. Attachments: Debug screenshots (forest vs city), FPS vids.
X post w/ table:
SDTD-25093 related? QA repro easy—heap 100% crash risk in old saves too.
**Summary:** Cities/POIs cause severe memory/streaming thrash even on fresh lvl0/GS0 worlds. Heap pins at 98-100%, MountScope "savedata0" mount/unmount loops, FPS collapses to teens—even standing still after exploration. Not graphics load: Chunk streaming + persistence + PS5 RAM/SSD interaction.
**Observed Debug Data (aiddebug / showchunkdata):**
| Metric | Forest Idle | City/POI Idle | Notes |
|--------|-------------|---------------|-------|
| Chunks | ~225-240 | ~240 | Climbs post-exploration |
| Heap | 97-98% (1822/1873 MB) | 99-100% (1921.7/1921.7 MB) | Creeps → pins → forced cleanup hitch cycle |
| MountScope Loops | 10-15 /5s ("savedata0" unmount/mount) | 12+ /5s | Repeated failures ("ReqBlocks=0 WasCreated=False") |
| Save Spikes | Vehicle/Turret writes (0.05s) | + Terrain Align WRN spam | "Saving 167 chunks took 1005ms" examples |
| FPS | 17-41 | Teens (25.7 → 10-15) | Idle collapse |
**Pattern:** Heap rises (vehicles/turrets/AI ticks) → max → GC hitch → repeat. v2.5 RWG/AI changes + console SSD = regression (pre-2.5 milder).
**Reproduction Steps (Required - Fresh World, 5min Test):**
1. New Game > Advanced Gen: 4km Forest RWG, Max Spawned Zombies=4, Walkers only, No Blood Moons/Storms/Biomes, Performance Mode/View Distance=1/FSR Off.
2. Pause > Options > General > "Open Console Button in Pause Menu" = ON.
3. In-game: Pause > Console > `aiddebug` (toggle ON for spam) + `showchunkdata` (heap/chunks).
4. Forest idle 1min: Screenshot console/FPS (Share > Recent > Edit > FPS overlay).
5. Drive/explore into city/POI, idle 2min: Screenshot again—watch heap climb, FPS tank, MountScope spam.
6. `aiddebug` OFF > `saveworld`.
**Platform:** PS5, v2.5 b32 (post-Jan 26 vehicle hotfix). SP/MP tested. Attachments: Debug screenshots (forest vs city), FPS vids.
X post w/ table:
SDTD-25093 related? QA repro easy—heap 100% crash risk in old saves too.
- Reproduction Steps
- Enable & Run Debug Console (Capture Baseline)
- Link to Logs
- https://x.com/i/status/2018922969473393023
- Link to Screenshot/Video
- https://x.com/i/status/2018922969473393023