I feel like a lot of basic stuff is broken or non-existent in Xcode. For instance, project text search on my machine freezes up the entire IDE for half an hour, which is ridiculous since A) it's not an unusually large project, and B) it's on an SSD, and it should be running search in a separate thread anyway.. Not to mention last time I used Xcode (6.2) it crashed on me 7 times in the span of an hour on basic things, like unlocking a file. I wish apple would focus on getting the basics right. It sucks because there's not much of an alternative, but it's by far my least favorite IDE to use.
Is your search scope too broad? Too many Pods maybe? I've never had an issue with project text search. The only time I've ever had that many problems in an iOS dev workflow was years ago when I was briefly running OSX through VMWare.
There's something else going on with your environment, it shouldn't be giving you this many problems.
Does xcode use Spotlight for search? I don't think it does. It clearly pounds the disk when searching but as Spotlight is optional and you can choose to not index various locations, relying on Spotlight for search (and being unable to search locations x, y and z) would mean that xcode would not find results in x, y, and z.
