This page allows to compare old WebSid versions. To level the playing field all versions have been retrofitted with time measurements and have been recomiled to WebAssembly using the same Emscripten release.
The purpose of this page is to track down new bugs (that might have slipped in with some change) more quickly. If you found something that worked before but not anymore, then your bug-report should include the information between which of the above versions the behavior changed.
The "LEGACY" version is the last release of the original implementation that had still used a "predictive approach" to emulation. It is obvious that this version actually runs MUCH faster than the current "cycle-exact approach". (Though it is certainly nice that the legacy version runs on much slower devices, it has unfixable flaws with regard of correct handling of certain SID-ADSR and RSID timing effects.)