I have similar issue(s) with lag; it's *NOT* computer side-
Brand new Computer, and still getting lag- which I was previously attributing to a very old (2008 or even older) underpowered Compaq. Nope. :-/ either it's an internet connection issue
(Verizon DSL, has been known to "downgrade" the service provided to their customers without prior notice; and only restore the "offered" level of service with significant effort; they claim it's because the individual servers which people are connected to become slowly more heavily trafficked, thus straining the system... in Response? then they should build more servers, since they're NOT making good on their promised claims)
Or
it's something about BC itself. O.o
I would like to think that BC isn't making itself slowly more laggy; and I know that at some points, with seemingly no reason at all, it works like a charm for me (lag-free!) soooo... O.o