New Persona skin downloading/rendering causes degraded client performance

Partner Rank:
Critical - 1

Verification Builds:
1.14.60

Regression Builds:
1.14.30

Summary:
New Persona skin downloading/rendering causes degraded client performance

Affects currently Live Content: Yes

Impact:
Hotfix 6 (1.14.60) fixed a Persona exploit in which the client trusted all the Persona geometry from another client. H6 now reaches out to a Microsoft server to download all the pieces.

During the loading of a H6 Persona skin, the client experiences frame drops and hitches that lead to a very unstable game experience.

Repro Steps:

Repro - WITH Persona:
Join The Hive Featured Server
Run the following command:
/toggleperformance
You should receive a chat message confirming that Performance mode was disabled
Rejoin the server

Repro - WITHOUT persona:
Run the command again
/toggleperformance
You should receive a chat message confirming that Performance mode was enabled
Rejoin the server

Observed Results:
With Persona enabled (performance mode OFF) the client experiences drops in FPS and performance

Expected Results:
Having Persona enabled shouldn't have a major impact on client performance

Screenshots/Videos attached: No

Notes:
Persona has always had SOME impact on FPS in areas with a lot of players. However, H6 performance makes the situation bad enough to have an effect on the game experience.