Fortnite just cut its install size by over 60GB
Total install size is now roughly 31.5GB. The update also plans to improve loading times and ensure that future updates should be a whole lot less taxing.
As quoted by Fortnite's 14.40 patch:
Please note the patch size will be larger than normal on PC (approx. 27 GB). This is to make optimizations on PC resulting in a massively reduced Fortnite file size (over 60 GB smaller), smaller downloads for future patches, and improved loading performance.