phpstan/phpstan pack resolves with a single thread only

[Sebastian Thiel (Byron)]

Note that this issue is highly related to #2819, as we might end up with a more standard pack resolution algorithm, one that can handle Azure repos.

Discussed in #2422

^{Originally posted by homersimpsons February 7, 2026}
Today I gix clone https://github.com/phpstan/phpstan.git and it took ~20 minutes:

❯ gix clone https://github.com/phpstan/phpstan.git
 13:49:18 indexing done 100.7K objects in 850.33s (118.0 objects/s)             
 13:49:18 decompressing done 18.3GB in 850.33s (21.5MB/s)                       
 13:54:35     Resolving done 100.7K objects in 317.26s (317.0 objects/s)        
 13:54:35      Decoding done 160.2GB in 317.27s (504.9MB/s)                     
 13:54:35 writing index file done 3.3MB in 0.03s (130.2MB/s)                    
 13:54:35  create index file done 100.7K objects in 1167.72s (86.0 objects/s)   
 13:54:36          read pack done 6.9GB in 1167.94s (5.9MB/s)                   
 13:54:36           checkout done 786.0 files in 0.13s (6.0K files/s)           
 13:54:36            writing done 67.8MB in 0.13s (521.7MB/s)   

(note that was on wifi and around 5MB/s for "half" of the download and then 30MB/s for the other "half")

I hence ran git clone https://github.com/phpstan/phpstan.git to compare the results:

❯ time git clone https://github.com/phpstan/phpstan.git
Cloning into 'phpstan'...
remote: Enumerating objects: 100714, done.
remote: Counting objects: 100% (15/15), done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 100714 (delta 3), reused 8 (delta 3), pack-reused 100699 (from 1)
Receiving objects: 100% (100714/100714), 6.43 GiB | 21.10 MiB/s, done.
Resolving deltas: 100% (66589/66589), done.

real	7m6.327s
user	19m56.695s
sys	0m56.571s

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Original issue: #2424

[Sebastian Thiel (Byron)]

Fixed - it now resolves times faster than Git: #2854