Jumpgate is really chugging on large maps now. I'm not sure what has changed, but when I used it about a month ago, it had decent (but still not great) performance on larger maps but was otherwise too unstable to use. Now, I am trying it again but I can hardly even open the larger maps. Many maps take 30-60 seconds to load if they don't hang entirely. And the ones I can open are using more than double the memory resources (I've seen as much as 1.1 GB) that the old engine is using.
For example, I have a 130x110 map with a lot of light sources. Here is what I observed:
Old version: load time = 15 seconds, memory usage 500 MB. Speed once loaded = clunky.
Jumpgate: load time ~ 3 minutes, memory usage 1.1 GB. Speed once loaded = very slightly less clunky.
Even without the lighting (just an empty 130x110 zone), it takes a surprisingly long time to load into the blank page.