Loader perf/fixes

- [x] fix some random global failure

- [x] don't re-allocate the resolve function for each requireModule
- [x] more accurate numbers

seems to be a smallish improvement on android 4.4.4 (maybe more on older)
So android is like 5->10x slower then everything else... include iOS 8, those other browser all seem to be about the same. But android is slightly better.

before:
```
685ms - 736ms cold, 510 - 680ms hot
```

after:
```
 585 - 700ms cold, 425 - 510ms hot
```