I've always had problems making this device really fast.
I'm using it 500-1000MHz, swap on sd, autoupdate off, hwsync on.
It's very smooth until it runs out of physical RAM, and have to use its swap.
After that time, it struggles for seconds even if it's just have to do a screen rotate.
I've seen videos on youtube from N900's that opens/closes/uses dozens of apps without any delay ( https://www.youtube.com/watch?v=NCQaxqqRzm4 for example)... I just don't know, how they've done that kind of tweaking.

Tried many swappolube-settings (default, proposed, my custom), it became faster, but not THAT fast.
I'm using my custom transitions, a fast, stable, nice setup with no unnecessary eye-candy.
My system is clean, minimal, with only two desktops, very few widgets (Foreca, nameday, data usage), no unnecassary things running in RAM.

On a previous N900 I've tried the speedpatch and batterypatch, with those my system lost speed instead of gaining.
I've noticed that the CPU's up_treshold and sampling rate parameter in power kernel settings is influencing the system's responsivity pretty much.

Any ideas of making the device that fast as it seems to be on that video?

What's are your guys swap settings (in detail if I might ask).