i'm no expert, but i think the dash is slower than gnome-shell because:
1) it seems the dash acts like a separate program that needs to start 
everytime.  - Gnome-shell seems to be fully loaded in the background.
2)  the dynamic content. everytime the  dash opens, it needs to connect to the 
database and retrieve the items. it does so right from the start. when you 
start typing, with each letter, a new search is started to try and match.  - 
Gnome Shell starts with a fixed list, and only searches when you type.
3) there's less animation involved. gnome-shell doesn't have previews, let 
alone the split-and-zoom effect. also the windows aren't displayed behind the 
overview, so no blur is needed, just a dark overlay. also scrolling the menu is 
less smooth than in unity dash.

i like the idea behind unity more than gnome-shell, but right now, i'm
almost scared to open the dash. i found myself looking for an app in the
launcher, notice it's not there, open a terminal instead and start the
app from command line.

i'm willing to lose eyecandy if it makes the dash work again.

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https://bugs.launchpad.net/bugs/814833

Title:
  Opening the dash is very slow and laggy

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