For previewing file, press `C-c C-f` to enable `follow-mode`. Then, a buffer is opened whenever you move your highlight to a file.

For saving buffer, Helm offers an action to save:

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https://preview.redd.it/1sszl5rsgc1c1.png?width=436&format=png&auto=webp&s=5683d25b81da642f28fc9cba4846a882649bc82f

By default, you press `tab` to access action menu.

Yes, with air cooler.

Except that the “perfect” software is all wrong when the next day, the software requirement turns 180 degree. That’s why you need software environment that is resistance to changes and a dynamic development environment will never go away.

I dpn’t see lots of tools offer that feature in a simple manner. Take Python, for example, if your script crashes during the run, so you lose your running state to investigate what the problem is, fix it on the fly, and resume.

- Get better hardware if you are still on old hardware 5 or more years ago. A budget $300 - $500 PC with modern CPUs and a decent SSD will be significant faster than whatever 5 years ago.

- If you’re on Windows, compiled your own Emacs, then compile every packages (built-in or 3rd party) with native-comp. Here’s a guide: https://www.reddit.com/r/emacs/comments/131354i/guide_compile_your_own_emacs_to_make_it_really/

- ???

- Enjoy!