Optimize startup

[taooceros]

A few enhancement I found during the investigation of #371

[taooceros]

Oops, let me fix the build fail.

[jjw24]

version bumps as well please

[jjw24]

@taooceros need to also bump bookmarks plugin version.

Does removing readonly improve anything?

I don't remember, remind me again what's the benefit of using enumerate over get for directories?

[jjw24]

See comments

[taooceros]

@taooceros need to also bump bookmarks plugin version.

Does removing readonly improve anything?

I don't remember, remind me again what's the benefit of using enumerate over get for directories?

No, but readonly requires initialization in constructor, while we construct instance in sync. I move that to Init() to allow parallel initialization.

[taooceros]

I don't remember, remind me again what's the benefit of using enumerate over get for directories?

Sorry I miss this question. It will be faster because we don't need to wait the enumeration finish to create an array, but can do what we want as the enumeration going. GetDirectories/GetFiles will return an array, while enumerateDirectories will return an IEnumerable.