Even though 2.8 comes with great features, it started having this disadvantage when using the subdivision surface on viewport mode. Decreasing quality render increases performance just a little bit, but obtaining the greatest performance while using this modifier is by setting the subdivision to 0 in viewport mode, but that won’t allow me to see how it would look like in render mode, so I always have to render myself to see the results.( this kind of issue happens on complex meshes and objects such as user-made characters or the monkey head)
This kind of problem doesn’t happen in 2.79.
Please fix this in the next beta update
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You could just use google to find out why subdiv modifier is so slow right now, a lot of people asked about this already. In short, new OpenSubdiv is not fully implemented yet.
https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/Modeling#Subdivision_Surfaces_and_Multires
Does anyone know when this will be fully implemented because right now is still painfully slow.