Rob

Just encountered this as well, would love to know if there has been any investigation on this. I use another virtualized list inside each draggable column and this jump further...

Heya, if you run with logging on do you get any output? It could be discarding malformed files. But happy to investigate it ```py import logging logging.basicConfig(level=logging.WARN, format='%(levelname)s %(name)s %(message)s')...

what happens if you try my bflw compat mode, does that return the same data as `betfairlightweight` ```py from betfair_data import bflw for file in bflw.Files(paths): for market_books in file:...

Just had a look and both those files use `batb/batl` instead of `atb/atl` - currently this only support `atbl/atl` as thats the format that the offical sold betfair data comes...

Yea unfortunately thats the cause. I didnt know that Betfair has historic data files with batb in them now so thats new! :) I reckon for now stick with `betfairlightweight`...

The parser creates values on the fly, so the best (and i think only) way to currently speed it up is to short circuit the ```for update in file:``` loop,...

I'm really not familiar with Python development or package management, so I don't know what determines pip trying to build from source vs using the packaged binary wheels - but...

Sorry about the slow reply I've been a bit busy. I agree that this sounds like a good idea and something I should implement - in the mean time tho...