Mind blown!
I've been trying to make comments on a student thesis in Word on Mac, and it has virtually ground to a halt. The screen jerks, and there is a weird glitch which makes the document suddenly jump a few pages backwards. It's virtually impossible to use. I have paid around $200 dollars for my perpetual Microsoft Office licence. The experience was so bad I needed to use alternative software. I'd downloaded OnlyOffice out of curiosity, but had not really used it, so I decided to give it a whirl. The huge file opens very quickly. Scrolling is smooth as butter. No obvious glitches. The OnlyOffice app itself takes up just over 1GB. Microsoft Office takes up around 10GB. My brief research suggests that the makers of OnlyOffice, Ascencio have only 200 employees, compared to Microsofts 228,000. They are around thousandth of the size. Mind well and truly blown.