Performance issues when sharing Redux store

[bessey]

As observed by myself and wmertens in #apollo-client-core. Every time an action occurs, Apollo spends a significant amount of time performing a deep equals of its state. Mostly quoting wmertens here:

In particular, https://github.com/apollostack/apollo-client/blob/ab3d49e7234bf44f9788ef0fd9b5544a2909fa3d/src/ApolloClient.ts#L465 gets executed every time I dispatch any action, and it looks at the active queries and does a deep comparison of their results, which takes 200ms in my case.

Seems to me that at the very least, there should be a test there for the action type, so it only fires on types starting with "APOLLO_"

[bessey]

Proposed fix found in #1104

[wmertens]

Note, #1104 is not a fix for the deep comparison.

[calebmer]

This should be fixed by #1136 where a deep equality check is replaced by a referential equality check (===).