Slow import

[fzimmermann89]

Importing mrpro takes on my (slow) work machine ~4s.

some heavy-hitters according to python -X importtime -c "import mrpro" are

• pypulseq -> time python -c "import pypulseq" -> 2.9s
• torch -> 1s
• pydicom -> 0.3 s
• ismrmrd -> 0.2 s

moving pypulseq import to a function scoped import in the pulseq trajectory reduces the import time to 1.4s

[fzimmermann89]

...maybe this is alos something to fix in pypulseq? @schuenke

[fzimmermann89]

Updating pypulseq to current GitHub version reduces the issue to ~ 2.5s.