`git -C resources submodule update` is taking a huge amount of time about pasta HOT 6 OPEN

(lfd-pasta) dark_matter@DarkMatter ~/l/l/PaStA (master)> ./pasta -h
2020-07-20 13:27:05,420 PaStA           INFO     Cmdline: ./pasta -h
PaStA - The Patch Stack Analysis (PaStA 0.3)

usage: ./pasta [-d] [-c project_name] sub [-h|--help]
where sub is one of:
  analyse
  check_connectivity
  check_mbox
  compare
  form_patchwork_relations
  maintainers_stats
  optimise_cluster
  prepare_evaluation
  rate
  sync
  set_config
  show_cluster
  statistics
  compare_stacks
  compare_clusters
  patch_descriptions
  ripup
  upstream_history
  web

If -c is not provided, PaStA will choose ./config as config file

Copyright (c) OTH Regensburg, 2016-2017
Licensed under GPLv2 (See COPYING)
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Ralf Ramsauer.

(lfd-pasta) dark_matter@DarkMatter ~/l/l/PaStA (master) [1]> ./pasta sync -mbox
2020-07-20 11:57:19,928 PaStA           INFO     Cmdline: ./pasta sync -mbox
2020-07-20 11:57:19,929 pypasta.Config  INFO     Loading configuration: linux
2020-07-20 11:57:20,046 Repository.Mbox INFO     Loading mailbox subsystem
2020-07-20 11:57:27,277 Repository.Mbox INFO       ↪ loaded invalid mail index: found 5469124 invalid mails
2020-07-20 11:57:27,277 Repository.Mbox INFO     Loading public inboxes
2020-07-20 11:57:32,263 Repository.Mbox INFO       ↪ loaded mail index for [email protected] (shard 0): found 214516 mails
2020-07-20 11:57:34,218 pypasta.Config  INFO     Renewing upstream commit hash file
2020-07-20 11:57:36,109 pypasta.Config  INFO       ↪ done
2020-07-20 11:57:36,123 Repository.Mbox INFO     Update list [email protected]
2020-07-20 11:57:40,098 Repository.Mbox INFO     Updating 1 emails
2020-07-20 11:57:40,100 Repository.Mbox WARNING  Unable to parse Message ID: 
2020-07-20 11:57:41,616 Repository.Mbox INFO     Loading mailbox subsystem
2020-07-20 11:57:48,804 Repository.Mbox INFO       ↪ loaded invalid mail index: found 5469124 invalid mails
2020-07-20 11:57:48,804 Repository.Mbox INFO     Loading public inboxes
2020-07-20 11:57:53,278 Repository.Mbox INFO       ↪ loaded mail index for [email protected] (shard 0): found 214516 mails
2020-07-20 11:57:54,703 tory.Repository INFO     Loading upstream commit cache
2020-07-20 11:58:06,093 tory.Repository INFO       ↪ Loaded 42358 commits from cache file
2020-07-20 11:58:06,138 tory.Repository INFO     Evicting 0 commits from cache
2020-07-20 11:58:08,609 tory.Repository INFO     Loading mbox commit cache
2020-07-20 11:58:09,041 tory.Repository INFO       ↪ Loaded 4649 commits from cache file
2020-07-20 11:58:09,044 tory.Repository INFO     Evicting 0 commits from cache
Traceback (most recent call last):
  File "./pasta", line 193, in <module>
    ret = main(deepcopy(sys.argv))
  File "./pasta", line 180, in main
    return sync(config, argv)
  File "/home/dark_matter/linux_work/lfd-pasta/PaStA/bin/pasta_sync.py", line 105, in sync
    repo.mbox.threads.update()
  File "/home/dark_matter/linux_work/lfd-pasta/PaStA/pypasta/Repository/MailThread.py", line 71, in update
    log.info('Updating mail thread cache', self.reply_to_dict)
AttributeError: 'MailThread' object has no attribute 'reply_to_dict'