Memory Budget
prototypeKnow before you build whether your zone will fit the budget, rather than finding out at publish time.
100,000 units per streaming zone
This is a hard UEFN cap, not a recommendation: beyond it, publishing is simply refused. No third-party tool helps budget for it up front today.
The cap comes from Epic. The unit costs per category come from the maps Vortex has shipped: orders of magnitude to rough out a budget, to be replaced by your own measurements as soon as you have them.
Streaming zone total
24,600 / 100,000
Remaining budget
75,400
24.6% of the cap. Comfortable margin. Keep a reserve for polish passes, they always cost more than planned.
Zone contents
3,600 u
Simple prop: 20 units per item. Crate, fence, sign. Light mesh, a single material, no complex collision.
16,000 u
Building module: 400 units per item. Wall, floor, stairs, facade section placed in series.
5,000 u
Character or animation: 2,500 units per item. Skeleton, animation set, full NPC. The heaviest category.
Breakdown by category
Building module
16,000 (65 %)
Character or animation
5,000 (20 %)
Simple prop
3,600 (15 %)
Unit costs: Vortex estimates, to be refined with your own measurements in the editor. Epic publishes no official table. Only the 100,000 unit cap per streaming zone is an Epic figure.
Tool maturity
What this tool does
- Adds up your zone's memory cost and compares it with the 100,000 unit cap UEFN enforces.
- Flags the caution threshold at 75% then the danger threshold at 95%, before publishing is refused.
- Gives the breakdown by category, so you know what to trim first.
- Owns its numbers: unit costs are Vortex estimates, clearly labelled as such.
What is still missing
- No read of the UEFN project: rows are typed by hand, not imported.
- Unit costs are orders of magnitude per category, not asset-by-asset measurements.
- No handling of several streaming zones nor of their overlap.