Adding a few thoughts to sergeant_york 

There are three criteria when to tile and when not:

the load on the database server when requesting the layer or layer group
the frequency of the user requests for that layer
the requirements for currency or data changes in the layer

That is why Google, Bing, OSM etc. have such a success. 20+ layers are a
huge load on a database, everyone needs a base map as reference and well -
the currency is not so good, but then tiling the entire world is no small
feat. Use tiling strategically and where it makes sense. If you work in the
water business, it may make sense to tile the hydrology layer, or better if
you provide maps for property purposes it can make sense to tile the
cadastre, if the cadastre changes too quickly then tiling may make no sense,
if you're dealing with building permits and you need always the latest
information likewise. 
It is all a question of the purpose of your map. Don't tile just because you
can.



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