Browser performance issue

[Beanow]

In a very similar fashion to libp2p/js-libp2p-secio#92 I find that adding large files spends a huge amount of time garbage collecting buffers.

I.e. adding a 55MB file cost me about 20 seconds doing >10k GC runs on Firefox.

I'm in the process of narrowing down the culprit, but it seems to be the pull-block implementation used in the fixed size chunker.

[daviddias]

@Beanow could you share an update of the results with the new pull-block?

[Beanow]

@diasdavid pull-block 1.2.1 makes a huge difference.
As a test I added 5 large files, totaling 334MB.

pull-block 1.2.0

• Takes minutes to complete
• Firefox freezes regularly
• Up to 15K garbage collection runs per file

pull-block 1.2.1

• Took ~24 seconds
• Some stutters, but no freezing
• 2400 GC's total

A new install of IPFS does not bring it in yet though.
"pull-block": "^1.2.1" in the root package.json was required.

[daviddias]

Wowow! That is incredible. Thanks so much @Beanow!

[daviddias]

Continuous on #190