I have a rather weak computer myself - but vote for keeping the new maps.
Just a suggestion to the developers: don't squeeze in everything that might be cool, keep resource-hungy stuff to a minimum, and think twice about the size of the map - that "Helm's Deep"-map is already almost too big for a 80 or 100 slot server - only is fun on the 200+ slot native server, and some new ones include whole towns that no-one will ever really explore in 6 minutes, but they still eat resources and add lagggg on a server that is seemingly not the strongest either...