Designer Find/Replace suddenly taking much longer

For the past few days, every time I invoke a search with the Find/Replace tool, it takes several seconds while attempting to connect with the gateway:


This wouldn't bother me so much, except that when it finally finishes, the window gets minimized. Any ideas what could be causing this? I don't see any other indicators that the gateway is bogged down or unresponsive, so I'm assuming it's an issue with the network...?