Slow writing & performance regression in V4

[HighPriest]

Issue

I am parsing a big repository with hundreds of ini files. It takes quite a while to go through each file, so the total execution gets unbearably long.

I've measured time of execution of each portion of the code I've written & I've noticed that:

• Reading file contents & converting into hashtable is quite fast
• Modifying the hashtable or maping it to another variable is plenty fast
• Writing to file with Export-Ini takes a significant portion of execution time

I've also noticed a regression in execution time between v3 & v4, of around 100ms (in context of entire script)

Solution

I believe the slow execution of export, comes from generating I/O operation for each output line, using Out-File.
Even for append operation, it should be faster to read the file we are appending into buffer, append chunk of data in memory & then write entire buffer back into file.

[HighPriest]

Solution proposed in #80