By keeping it under 10K of text and by avoiding graphics, it loads quickly so as not to hold you hostage while wasting your time or money waiting for meaningless graphics to appear.
Text only browsers like Lynx.
2400 baud and even 1200 baud modems - hardy speedy in these days of 33.6 baud modems, but OK for lots of retired people with more patience than money. Millions of other genealogists upgraded to Netscape 1.1PE in the spring, summer and fall of 1995. Most still do not realize it is so buggy it trashes all forms and tables at the fir sign of a HTML tag of that sort. All of them can be downloaded by Lynx browsers.