Improve startup time

• Long-running tasks on app startup are bad, because it happens in the request loop (at least on the first request).
• dateparser import takes 600-800ms

See AlekSIS-Core#875 (closed)

added type::bug label

assigned to @hansegucker

added 1 commit

• 175dd307 - Move loading of default templates to post_migrate

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changed title from Move loading of default templates to post_migrate to Improve startup time

added 1 commit

• 9a6cb85c - Delay import of dateparser because it is very slow

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changed the description

mentioned in commit 898a6813

merged