Reproduction steps:
1) Download and open user's attached project
2) Build asset bundles ((upper menu) BuildTools -> Build -> Build AssetBundles for Android)
3) Build and run on any Android device
4) Press 'Load' button
-- Notice that in left top corner loading time is printed

Actual result:
When Resources.LoadAsync called next AssetBundle.LoadAsset takes 300 - 600 ms to load.

Expected result:
Resources.LoadAsync should not affect AssetBundle loading time.

Tested with Android and iOS and Windows 10. Every platform reproduces this issue.

Reproduced with:
2017.1.0a5, 5.6.0f2, 5.5.2p4, 5.4.5f1