IPhone 5c slow down after a year?

Does it become very slow and sluggish? I might get it but I don't want it to become irritating because I the speed.

Bear in mind that the iPhone 5c is just a cheap remake of the iPhone 5, an almost 2 year old phone. It's worse than the 5 in many ways but I right now it definitely isn't slow or laggy. You could get a solid 1 year out of it minimum before it begins to show it's age.

Only as slow and sluggish as it's user. If you keep the Safari browser cleaned up, and don't glut the phone down with bloat and junk and periodically erase ancient text threads it will run just fine like any other phone. 5c chip is the same as in 5s. No difference. You take care of it and it will take care of you. Still have a 2009 3gs along with my 4s and 5. Best luck.