Hello, @Baka-csaba and All,
Could you check if you, presently, use the Word Wrap feature ( menu View > Word Wrap ) ? I often noticed that this reduces, drastically, easy navigation, throughout important files, even if their contents do not exceed the present window editor length !
I just did a test, with a 25Mb file, containing 458,000 lines, about. For instance, when trying to get the end of this file, with the Ctrl + End shortcut, it took ~6s, on my old Win XP machine, with the Word Wrap option set. When this option is unset, the same operation is instantaneous :-))
And, idem, with the Page Up / Page Down keys. So, I would advise you to always uncheck this feature, when navigating in big size files :-))
Best Regards,
guy038