RSS optimized

Highlights

Faster and lighter workflows

• Much faster and lighter write_db_to_brightway() on Brightway 2.5
• Lower RAM usage during cold NewDatabase() initialization
• Leaner post-update() scenario caching and reload
• Faster Brightway superstructure export

Better Brightway export behavior

• Fast exports now behave much more like regular Brightway databases
• Exported databases remain searchable and browsable
• Activity Browser compatibility was fixed by ensuring process types are set
• Export UX is clearer, with progress bars, overwrite notices, and an explicit “database
  written” message

Updated data and assumptions

• Refreshed solar PV efficiency assumptions
• Added new PV anchor years and a perovskite-Si tandem trajectory
• Expanded GCAM variable mappings across sectors
• Updated GCAM regional mapping assets, including Ukraine coverage

Workflow and data fixes

• Better IAM normalization when an exact 2020 datapoint is missing
• End-of-pipe emissions updates moved later in the workflow to avoid ordering issues
• Improved electricity validation diagnostics
• Fixed cold-cache reload behavior
• Fixed migrated inventory gap filling, where replacement-based exchanges could be
  duplicated incorrectly after migration splits

In one sentence

2.4.0 moves premise from a mostly correct but heavy Brightway export workflow to a much
leaner one, while also updating PV and GCAM assumptions and fixing several export, cache,
and inventory edge cases.

Observed local benchmark

On a local full three-scenario cold workflow benchmark, compared to 2.3.9:

• runtime dropped from about 2564 s to about 717 s
• peak RSS dropped from about 4.38 GiB to about 2.03 GiB