SanDisk MicroSD card performance tests

I have several MicroSD cards.. I've been checking them for performance.
I use them in a GoPro Hero 5 Black or in my Samsung S9 for photo and 4k video.

What cardreader was used?

At first I tried with my Kingston FCR-HS3 Card-Reader I usually use (for CF Cards) but I noticed about 10 MB/s slower transferrates each time.

So.. for testing I've been using now a USB3 MicroSD Adapter UHS-1

I've been using CrystalDiskMark.
I ran the benchmark 2 times, best result is shown.

You can click on the images to buy the cards from Amazon via RefLink.

Here are my test results:

SanDisk Extreme U3 V30 MicroSD XC 64 GB

SanDisk Extreme U3 V30 MicroSD XC 128 GB

SanDisk Ultra A1 10 MicroSD XC 64 GB

Multi-threaded 7-Zip with Zstandard, Brotli, Lz4, Lz5 and Lizard Compression support

Great compression performance now available for use in windows and more

You can also get there the multithreading c library for Brotli, Lizard, LZ4, LZ5 and ZStandard used in it

Python LZ4 lib

I've also found a good python multi-threaded lib for LZ4

Easy to use

import lz4framed

compressed = lz4framed.compress(b'my normal text')

uncompressed = lz4framed.decompress(compressed)

file compression

with open('somefile.csv', 'wb') as f:
    # Context automatically finalises frame on completion, unless an exception occurs
    with Compressor(f) as c:
            while (...):
        except Lz4FramedNoDataError:

file decompression

with open('somefile.csv.lz4', 'rb') as f:
        for chunk in Decompressor(f):
    except Lz4FramedNoDataError:
        # Compress frame data incomplete - error case

command line utility

python3 -mlz4framed
USAGE: lz4framed (compress|decompress) (INFILE|-) [OUTFILE]

(De)compresses an lz4 frame. Input is read from INFILE unless set to '-', in
which case stdin is used. If OUTFILE is not specified, output goes to stdout.

Some benchmarks

Quick Benchmark: Gzip vs Bzip2 vs LZMA vs XZ vs LZ4 vs LZO

Tested were: Compression ratio, Compression time, Decompression time, Memory requirements on compression, Memory requirements on decompression, Time to compress, Time to decompress, Memory used, Compression ratio