i am trying to import a csv file that has 50,000 entries to woo commerce. i am using wp all import plugin. now i know there are certain criteria that can be met to speed up the process however having done some further research into this i can see that because of images it can slow down the process quite drastically. i have seen that word press creates multiple sizes of that image when processing the csv. how can this be avoided? i only require the main image which will be used as the thumbnail for the product and for the main image on the product page. each product will only have 1 image. i have seen that using a cdn can speed this up however how do i go about doing this. also is better to split the file up into smaller csv to make the import run successfully? if so what is optimum amount of lines i should have per csv?