I recently updated a router in my network from version 2.9.? to 3.15. Since then I've had a few issues with the router. It now takes quite a while to connect to the router (using winbox or telnet, haven't tried anything else), the interface traffic is horribly inaccurate (I have a max inbound bandwidth of 3M, and I find myself looking at 8-12M at times), Torch is just as inaccurate, queues no longer seem to throttle properly, if at all, though this could be part of the inaccuracies from the traffic, and it seems to have several other performance issues, for example, it takes up to 10 seconds to update any 'live' information that used to update at least once a second, it can take time to try to switch menus, and a few other things that just make it seem slow. I've got a dual core Intel processor and a gig of ram in the router, which have virtually no load on them.
The router worked great until I updated it, if anybody has any ideas or suggestions on how to fix this, please let me know.