What the change means is that before, when you had an action with a condition (‘current user is logged in’), even if the condition was true (the user wasn’t logged in), the properties of the action were still evaluated, which was could use some time and capacity.
From now on, the properties used to run the action will only be calculated if the condition evaluates to yes. For most workflows that won’t make a difference, but for long workflows with a lot of condition, things should be faster.