If you use QMC to reload your QVW, you might want to check the server logs.
That shows (amongst other info):
"(2017-06-12 06:37:14) Information: Physical FileSize=314.17 Mb. Memory Allocation Delta for this file=14.30 Mb. Available Physical Memory Before Open=28102.40 Mb. Available Physical Memory After Open=28113.57 Mb. Total Physical Memory=32767.14 Mb."
This is however before reload, but should enable you to get an idea of historical file sizes.