The decision to board passengers as following;
1) Pre-boards
2) 1-90
3) All others
is simply monstruous, considering that in one swoop you will be allowing half of the aircraft to board all at once. Handling both easyJet & Ryanair flights, I much prefer easyJet's system of segregating passengers into smaller groups of 30, for better comfort for both the passengers & to make the job more manageable for the PSA.