Konsole is a great terminal emulator and I used it for more then a decade (together with yakuake, which is Konsole anyway), but on my machine (8 years old Thinkpad with integrated Intel GPU) it's too slow in rendering on a 4k screen. Scrolling too fast in my nvim session makes it stutter.

Kitty (and I assume it's other accelerated brethren) is butter smooth when doing the same. I replace yakuake using a second Kitty process and a Kwin script to appear it and disappear it with F12 or another shortcut.