testkjs should made long-running to speed up run-javascriptcore-tests DumpRenderTree has a "long running" option, where it will stay launched and sit and wait for new data to come in and run it. testkjs could benefit from such as well. I expect it would *drastically* reduce how long it takes to run run-javascriptcore-tests (which is currently a ridiculously long time). testkjs would need to make a new global object for each test, but would want to keep around certain files in memory (the shell files) and just run those before any test it's given. A simple LRU cache of recently read-from-disk js files would probably do the trick.