As per bug #615765, the contents of the ps-gz files are currently read in the following way:
 * Fork and spawn asynchronously into a gunzip process, and store the decompressed contents in a new temp file up to 20 MBytes.
 * The, extract the temporary uncompressed file using the ps extractor.

The ps-extractor then:
 * Reads the whole PS file contents line by line, using a newly-allocated buffer for each new line.


These extractions can get improved in the following way:
 * Don't use a temporary file for the uncompressed ps-gz file contents
 * Re-use the same buffer when iterating each line in the ps extractor, no need to allocate a new one each time.
 * Stop reading the uncompressed PS file if reached a max limit (maybe the same one of 20MBytes can be used, just a safe one)