Poor performance with large .txt

Notepad++ was not designed for large text files, instead I recommend a program called glogg. found here: http://glogg.bonnefon.org/

and I swear to god if anyone dislikes this post and complains that I'm answering with a link then grow up because I did fully answer the question.

Try Ultra Edit Its the best in this case.

Features at a glance

• Column / block editing

• Multi-caret editing

• Multi-select

• Syntax highlighting

• Integrated FTP client

• Integrated SSH/telnet

• Editor themes

• Large file editing +4GB

• File / data sorting

• Powerful search

• Supports regex

• CSV data reformatting

• Macros and scripts

• File compare

• Smart templates

I edit my huge files with Microsoft Visual Studio. It is super fast and handles any size! try it! You can download free version (Community edition)

UPDATE:

Notepad++ build 64bit is available now. You can use it.