React can handle all of your items just fine depending upon usage. (a) Using the key property, will give React a manner to determine likeness of elements (b)

React can handle all of your items just fine depending upon usage. (a) Using the key property, will give React a manner to determine likeness of elements (b) Don't calculate the expensive things at render time, do them when loading or modifying state. (c) Is related to a, but I haven't run into large problems with this personally. (d) React does batch changes to an extent I believe.