The editor is naturally slower than the build specifically for debugging. If you want to make the editor resemble the performance a bit closer to the build, you can open up BinderConnection.cs AND BinderConnection(T).cs and comment out the define at the very first line of the scripts.
As for memory usage, can you please post a screenshot of that? I’ve redone the test here for 1001 flowscripts and the garbage allocation was 0, as well as the “scene memory” usage in the profiler was 1.7MB. (with the defines commented out as explained before).