'nested tables' had a particularly deletarious effect upon WIN-98 2nd Edition with minimal system RAM. I used to have ~, and any page with 3 or 4 'table nestings' almost always resulted in a lovely BSOD. A 'stack overflow' was the official cause. Increasing the RAM helped but Win-98 had a 'software bug' that created this suseptability.
I much prefer using DIVisions, -they were made for and intended for just such nesting, and as such, work the processor much less.
And, -I have long since switched to XP (and Linux).