First I would like to state that I use Raspbian Jessie on my Pi 3.
My experience with Jessie was that it was a little sluggish initially. I did get latency in all tasks to improve after I did the following.
- Bumped up the Video memory to 256MB
Remove/purged the built-in swapfile that comes with Raspbian Jessie. It was bloody slow as it was running on the uSD card where the OS is at.
sudo apt-get purge dphys-swapfile dphys-config
Bought the fastest 16GB USB flash stick I could find.
Setup a 3GB Swap partition (doesn't need to be 3GB but I thought what the hell why not).
Installed F2FS and formatted the remaining space to F2FS for use. F2FS is the only file system to date that is designed for Flash.
Set swappiness to 60
Installed all new applications, scripts, program workspace, etc on the F2FS partition.
Last note, not really a step but more of a tip, don't use Firefox or Iceweasel as it is slow on the Pi, use the built-in bare-bones browser that comes with Raspbian Jessie as it is much more responsive and less latent.
Things that I could improve but would take time and mean perhaps blowing away everything so I haven't done yet; well install Rasbian on F2FS.
On another note, overclocking will heat up your ARM chip a lot faster which will then kick-off the protection algorithm when under sustained load to lower the clock speed so it doesn't burn out. If you want to stay overclocked then you will need active cooling on the ARM chip. Check Amazon as they sell those tiny fans for the Raspberry.
Currently as I said I am running Raspbian Jessie and have Kodi on top of it running 24/7. I also have a microserver (Python3 Flask) running 24/7 that accesses/runs certain commands that I have programmed so I can remotely get it to do things when away from home (a.k.a. IoT or Internet of Things). For example I have a Temper USB thermometer plugged in on a usb extension cord which the webserver can access to return back the room temperature. This is all running while Kodi is on even when people are actively watching movies or streaming from the net. I also have an NFS Client on it keeping tabs of my library of media on a File server I have, all while having multiple ssh sessions and tightvnc server running on it.
So in essence, the tiny $35 Raspberry packs a hell of a punch! Compare that to an Intel NUC which orders of magnitude more expensive.