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There are two layers here. The first is that, on startup, a v8 SnapshotCreator is created, and a snapshot-specific isolate/context is setup with our browser environment. This contains most of what was in Env.init and a good chunk of what was in ExecutionWorld.createContext. From this, we create a v8.StartupData which is used for the creation of all subsequent contexts. The snapshot sits at the application level, above the Env - it's re-used for all envs/isolates, so this gives a nice performance boost for both 1 connection opening multiple pages or multiple connections opening 1 page. The second layer is that the Snapshot data can be embedded into the binary, so that it doesn't have to be created on startup, but rather created at build-time. This improves the startup time (though, I'm not really sure how to measure that accurately...). The first layer is the big win (and just works as-is without any build / usage changes). with snapshot total runs 1000 total duration (ms) 7527 avg run duration (ms) 7 min run duration (ms) 5 max run duration (ms) 41 without snapshot total runs 1000 total duration (ms) 9350 avg run duration (ms) 9 min run duration (ms) 8 max run duration (ms) 42 To embed a snapshot into the binary, we first need to create the snapshot file: zig build -Doptimize=ReleaseFast snapshot_creator -- src/snapshot.bin And then build using the new snapshot_path argument: zig build -Dsnapshot_path=../../snapshot.bin -Doptimize=ReleaseFast The paths are weird, I know...since it's embedded, it needs to be inside the project path, hence we put it in src/snapshot.bin. And since it's embedded relative to the embedder (src/browser/js/Snapshot.zig) the path has to be relative to that, hence ../../snapshot.bin. I'm open to suggestions on improving this.
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Licensing
License names used in this document are as per SPDX License List.
The default license for this project is AGPL-3.0-only.
The following directories and their subdirectories are licensed under their original upstream licenses:
vendor/
tests/wpt/