I use klipper very heavily, especially the new search feature. I keep almost all my clipboard history, or a maximum items (>1000) Often I copy very big text to clipboard, and because of this, klipper is going to be unusable. It is going to be very slow, especially on search, delaying keystrokes by tens of seconds. I offer a solution: don't search items, that are >1kb (or may be customizable in config)
*** This bug has been marked as a duplicate of bug 360262 ***