Comment by rfgplk

The single most disappointing fact about (more or less) all text editors on the market today is how god awful their performance is. For most text editors, and when I say most I really do mean _most_, you can very easily start seeing noticeable lag and stuttering when making modifications, or even outright INPUT LAG when entering text. For very tiny buffers <1kB it's a rare occurrence (although bad editors lag there too), but once you start crossing the 10kB size it's dead obvious. For editing buffers >1MB, 99% of them are unusable due to a) writes taking SECONDS (how?) b) scrolling/using the buffer physically lagging out the editor itself. Which is really basic functionality that editors should be able to handle since it's rather trivial to come across a multiMB json/config file. Try a simple benchmark

   cd /tmp && dd if=/dev/random of=big_file bs=4096 count=10000

   [editor of choice big_file]

This should really be _trivial_ for any modern CPU.