6.2 lease filter delays - some findings

I have been playing with the lease filter:

what I found out that there are some fleets that load quickly, and some that load slow. This is for enterprises with many planes. For enterprises with few planes, all load quickly. I have one with 127 planes that doesn't have any delay whatsoever and one with 177 planes that already experiences delays.

The fleet types that load quickly do load quickly across all enterprises. The ones that load slowly do load slowly across all enterprises.

Whether they load quickly or slowly is not a matter of fleet size. I have fleets with 2 aircraft loading slowly and fleets with 200+ aircraft loading quickly.

When you are switching from:

a )  fast to slow: substantial delay.

b )  fast to fast: no delay

c )  slow to fast: slight delay about 1 sec

d )  slow to slow: very substantial delay

Maybe other players (with 177+ planes) can corroborate these findings and add theirs.

Fast:

E190

E195

E195 LR

E195 AR

A319-100 Light

A320-200 Light (enhanced)

A320-200 Medium

B737-700 BGW

B737-900 ER BGW

B737-900 ER HGW

B737-900 ER HGW (winglets)

Q400A

787-8

A321-200 standard (enhanced)

CRJ 700

CRJ 900

SSJ 100-95

Slow:

E170

E190 LR

E190 AR

B737-900 ER BGW (winglets)

Q300A

Q300B LR

737-300 HGW

737-500 BGW

737-600 BGW

737-800 HGW

A319-100 Light (enhanced)

A319-100 Medium (enhanced)

A319-100 Heavy

A319-100 Heavy (enhanced)

A319-100 High Density (enhanced)

A320-200 Medium (enhanced)

A320-200 Heavy

A320-200 Heavy (enhanced)

CRJ 900 LR

CRJ 1000 ER

Avro RJ 70

Avro RJ 85

Avro RJ 100

Strange:

(in two enterprise loads quickly, in one loads slowly)

B737-800 BGW

(in one enterprise loads quickly, in one loads slowly)

B737-300 BGW

B737-400 HGW

Moreover, if you try to buy an aircraft why using a Fleet Filter under "Leasing", and it's the slow fleet, the buy process is veryyyy slow and may result in Internal Error. If you do not use a filter and just look up for aircraft among all the listed aircraft, the buy is quick. Same problem as this player reports http://community.airlinesim.aero/topic/8005-neeeeeein-airlinesim-62-auf-bestandsserver-einspielen-was-meint-ihr/page-6#entry68183

I spent well above an hour today trying to figure out where this is coming from. But so far, to no avail. I know it's some database issue and I'm sure it has to do with the complex nature of contracts (several involved enterprises etc.) combined with flexible sorting/filtering. But I still don't get what's taking it so long in this particular case and with such differences between attributes that really should not matter for the queries. 

I'll do one more experiment, but than I'll have to quit and focus on more urgent stuff again.