My workflow is roughly as follows:
1) Ruthlessly cull in camera during the event if time and battery life permits (5 minutes gaps between races etc)
2) Copy remaining images from multiple cards into new folder on PC in parallel (multiple card readers).
3) Create new catalogue for this event, and import all the files building 1:1 previews.
4) Grab a coffee/dinner/beer/whatever whilst the PC imports the images (minute or two at most) and builds the 1:1 previews (up to 30 minutes)
5) Backup the photos to another drive.
You can then move quite quickly through the images in Library mode in LR, zooming in and out to check for sharpness etc. and use the keyboard to Pick images for processing, or give them a rating of 1-5 stars etc. Delete any really bad ones there and then, or just reject them and delete later.
Filter in LR for just the images that you have Picked or rated as required.
Edit first image, then sync settings with all other images taken at the same time/lighting conditions.
Ensure your LR install, catalogue and photos to be processed are stored on a fast NVME drive.
Increase the LR cache size to 20Gb or higher.
Lots of memory helps, as does lots of CPU cores for building the 1:1 previews and exporting which can be done in parallel.