A GAE python webapp I got splits its cost about evenly into 1) front instances and 2) data reads. What I can think of reducing the costs for data reads is store more items with memcache. But I don’t know how to reduce costs for the front instances. I’m using the F1 setting, how do I know whether other setting increase or decrease the cost? What happens if I enable the PageSpeed service?

A GAE python webapp I got splits its cost about evenly into 1) front
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About PageSpeed Service cost:
Have a look for more information here. But on the other hand there is an article (Enabling PageSpeed Optimization Service) in docs that says this:
About lowering front end instance costs you could have a smaller number of idle Instances as that reduces costs.