FYI, I have huge problems with your products at work. We use a variety of your products and competing products, on a project-by-project basis. I always advocate for your competitors.
One reason is that you made the business decision to attempt customer lock-in. You supported wikimedia-style text markup in your wiki (in addition to the GUI) so that people could migrate to your stuff, and then you took out that feature so that people would have trouble leaving. I'm sure that makes sense to an MBA, but I have been discouraging use of your products all throughout a large company.
The other reason is that yes, all your stuff is slow as fuck. OMG it is slow. The Java grows to consume gigabytes for no damn reason, and it munches CPU time, and generally it sucks pretty hard.
Golang might be right for you. I think it's the fastest choice available for development teams that can't handle stuff like pointers. On the other hand, I think you would still manage to sort-of-leak memory by hanging on to references that you really don't need.
I think you could fix the slowness problem by requiring all development and testing to be done on computers that are slower than the ones your customers use. Get an old Pentium II with 256 MiB of RAM... which is still overkill for the task at hand. Remember, back in the day we ran stuff like your products on computers with 8 MiB or less and a 486 or less. You can live with a Pentium II and 256 MiB of RAM, and the resulting performance of your software will delight your customers.