Well it would hopefully be ~5 threads: Images (png, jpg, dds) Models (blend, dae, obj) Zips (zip) Text Files (txt, xml, js) Or you could sort by file type, with an individual PNG thread, an individual Blend thread, etc.

Here is a bugfix update post-atlas 1.18.0 .  Fixed Two programs keeping versions of one map at the same time lose none and reuse no number. The record is changed under a lock that holds between programs. The versions window greys out The whole map and says why when the version cannot give both the text and the terrain (hold the pointer over it); Pin and Delete say so when a version cannot be changed. The list of what a mod replaces in the game is found once the game is closed, not remembered empty while it ran. Changed The Help menu, the civ emblems and the preview buttons are the same code as Mercator's, and the words that still spoke of a .bak copy in the design and the manual say "a version". README.md CHANGELOG.md post-atlas-1.18.0.zip

Sorry for the flooding - there is another stabilizing release fixing many things and make the entire package a bit easier to maintain and review. As usual, the release is available from the first post of this thread.  Fixed Mercator and post-Atlas can keep versions of one map at the same time without losing one or giving two the same number. The record of a map's versions is changed under a lock that holds between two separate programs (tested with four processes at once). Putting a version back as The whole map is refused when it would mix two versions - a version that holds only the text, or only the terrain, while the map has the other file now. File > Versions of this map... greys the choice out and says why when you hold the pointer over it. Pin and Delete in the versions window say so when a version cannot be changed, instead of failing silently. The Summary's list of what the map's mod replaces in the game is no longer empty while the game runs. Keeping a version and Also make a .zip read and write less at once: the record is read once, and the .zip is written to disk as it goes. Changed underneath (nothing should look different) The players, the Map box, the lasso and the dialogs of the Terrain tab, and the Entity Placer's list are parts of their own now; Find and Replace and Convert walls are plain code with tests of their own. One Help menu serves both tools.

My bad rm  /Users/xxx/Documents/GitHub/0ad/build/workspaces/gcc   or run make clean

I'm still not convinced it will not be hundreds of threads with no way to get files.