[Performance] Performance tests/opts

[jimdebeer]

useful for for example the method stuff that we are adding now

• sid can become a lot faster
• struct
• root/parent optimisations
• removal
• val in specific places [Val] Val in specific places #91
• re-enable the canvas example
• parent getter can be optmized
• optimise remove $test checking, add hasTests when setting a field with test on a subs
• $ in item needs to become faster

[jimdebeer]

switch dont remove tree -- just clean it (check if its faster)

[jimdebeer]

any can be optimised whens witching refs (reuse all keys that you can less mutations on the tree)

[jimdebeer]

make the npm example using state see the difference, see where the culprits are

[jimdebeer]

check if $any + ref changed can become faster -- also might be worth it to make $test ultra fast

[jimdebeer]

other thing to optimise are contexts