OSX versions and RAM requirements

[Mike Rowan]

Hi
My client has a number of elderly Macs (OSV 10.8.x) and one OSX10.11.6
(factory installation in a recent 4GB RAM machine).

Among my collection I have an iMac upgraded to 10.11.6 with 4GB RAM.

Both OSX machines run very slowly the client is contemplating increasing
the RAM.

While I use only Word, Excel and Omnis Studio 8 and Lightroom, the client
uses InDesign and other bits and pieces as well.

Is going to 8GB going to help the speed generally?

What would you recommend?

Your wise advice would be appreciated.