Optimized performance by replacing slice method with subarray

[g3ncl]

Hi, I think I have identified the reason behind the performance difference between running in browser vs Node.js. Unlike TypedArray.slice(), which generates a new copy of the sliced portion, Buffer.slice() produces a new buffer that shares memory with the original buffer, essentially behaving in the same way as the subarray() method. This discrepancy is why Buffer.slice() has been deprecated.

I ran some tests using three different videos:

File Size	Version	Execution Time (s)
556 MB	Original	4.731
	Updated	1.591
1.8 GB	Original	37.730
	Updated	4.596
6.1 GB	Original	396.933
	Updated	15.095

[JuanIrache]

Thanks Claudio. That's great!