Game launch time increases significantly when the skin_packs folder contains a large number of files

Summary:

When launching Minecraft for the first time after powering on the device, or after a few hours since the previous launch, the game takes significantly longer to reach the main menu if a large number of files are present in the premium_cache\skin_packs folder. The impact is significantly worse on lower-end devices.

Testing produced the following results:

This issue is problematic because normal browsing of the Marketplace and Dressing Room gradually accumulates files in the skin_packs folder. Over time, users will experience increasingly long launch times without any indication that the folder is responsible. Clearing the Marketplace cache through Settings > Storage does not clear the skin_packsfolder. As a result, users on platforms where this folder is inaccessible cannot clear it without performing a clean reinstall, which may result in data loss.

Steps to Reproduce:

1. Download the following skin_packs.zip folder. It contains 47,554 files generated through normal Marketplace and Dressing Room usage: https://mega.nz/file/n8l3GZyT#y1MLENwfxiRQy_owOQGQRtBarIXIHqV0CT1XZetqm1I

2. Unzip the folder

3. Move the unzipped folder to:
   AppData\Roaming\Minecraft Bedrock Preview\premium_cache

4. Restart the device, or wait a few hours since the last game launch.

5. Launch Minecraft Preview and measure the startup time.

6. Close Minecraft Preview

7. Delete the skin_packs folder.

8. Restart the device, or wait a few hours since the last game launch.

9. Launch Minecraft Preview again and compare the startup time.

Observed Results:

When a large number of files are present in the skin_packs folder, the game remains on a black screen for a significantly longer period before reaching the main menu. The slowdown is substantially more noticeable on lower-end hardware.

Expected Results:

Launch times should not be significantly affected by the number of files stored in the skin_packs folder and should remain comparable to those observed with a small cache.