Program: https://pavelfatin.com/typometer/
Win10, Java 9 installed.
CPU Intel Core i3, 3 GHz.
CudaText 1.133.5.5.
Tests with empty document and with tiny C++ snippet.
speed like in Win10 Notepad.

Test with big "cudatext.wiki" file (120Kb), with MediaWiki lexer, when caret is placed in the middle of the file on a new line.
not fast. 2 times slower.
Now I see that size of the window affects the Typometer much.
the same test with "cudatext.wiki" with small window and maximized window.

Let this topic be opened, for info for users.
OS: Ubuntu 20.04
WM: Openbox
DE: LXDE
ST 4113 memory usage: 195,6MB :-1:
Cud 1.138.1.2 memory usage: 53,3MB :+1:
Cud may use less memory if none-lexer is active, yes. With lexer Cud takes much more.
Cud may use less memory if none-lexer is active, yes. With lexer Cud takes much more.
My test was with HTML lexer... Very good!
Now my test on Linux, via “htop” tool, shows that Cud takes less memory when I open torrent.cpp file (c++ file from libtorrent repo, big file).
Most helpful comment
Now I see that size of the window affects the Typometer much.
the same test with "cudatext.wiki" with small window and maximized window.
Let this topic be opened, for info for users.