Improve performance of Pipeline

[bertfrees]

This is just a reference to snaekobbi/issues#28. This way I'm adding the issue to Nota's to-do list.

Conversion times must be brought down significantly if the system is to be used in production.

+1 from:

• SBS: Improve performance of Pipeline sbsdev/pipeline-mod-sbs#52
• NLB: Improve performance of Pipeline nlbdev/pipeline-mod-nlb#55
• Dedicon: Improve performance of Pipeline pipeline-mod-dedicon#51