That's not a "minor" problem you have: you have an ENTIRE duplicate scenery ( see those two control towers ) and that sign is coming from that scenery too. This is of course killing your performances, since you are seeing two CYVR airports at the same time...
As explained many times already on the forum, whenever you have "double-something", it's never a problem of the scenery, but a duplicate AFCAD coming from another product causing this.
The most common source of such problems are AFCADs coming with AI Traffic products like My Traffic, which are good only for default sceneries, but shouldn't be used if you have an addon of that airport. Use the free FSX Airport Scanner to search for AFCAD duplicates and remove all the ones outside the fsdreamteam folder or the FSX default scenery folder.