I just did some interactive shell loops and globs to compress everything and output CSV which I processed into an ASCII table, so I don't exactly have a pipeline I can modify and re-run the tests with compression speeds added ... but I can run some more interactive shell-glob-and-loop-based analysis to give you decompression speeds:

    ~/tmp/pdfbench $ hyperfine --warmup 2 \
    'for x in zst/*; do zstd -d >/dev/null <"$x"; done' \
    'for x in gz/*; do gzip -d >/dev/null <"$x"; done' \
    'for x in xz/*; do xz -d >/dev/null <"$x"; done' \
    'for x in br/*; do brotli -d >/dev/null <"$x"; done'
    Benchmark 1: for x in zst/*; do zstd -d >/dev/null <"$x"; done
      Time (mean ± σ):     164.6 ms ±   1.3 ms    [User: 83.6 ms, System: 72.4 ms]
      Range (min … max):   162.0 ms … 166.9 ms    17 runs
    
    Benchmark 2: for x in gz/*; do gzip -d >/dev/null <"$x"; done
      Time (mean ± σ):     143.0 ms ±   1.0 ms    [User: 87.6 ms, System: 43.6 ms]
      Range (min … max):   141.4 ms … 145.6 ms    20 runs
    
    Benchmark 3: for x in xz/*; do xz -d >/dev/null <"$x"; done
      Time (mean ± σ):     981.7 ms ±   1.6 ms    [User: 891.5 ms, System: 93.0 ms]
      Range (min … max):   978.7 ms … 984.3 ms    10 runs
    
    Benchmark 4: for x in br/*; do brotli -d >/dev/null <"$x"; done
      Time (mean ± σ):     254.5 ms ±   2.5 ms    [User: 172.9 ms, System: 67.4 ms]
      Range (min … max):   252.3 ms … 260.5 ms    11 runs
    
    Summary
      for x in gz/*; do gzip -d >/dev/null <"$x"; done ran
        1.15 ± 0.01 times faster than for x in zst/*; do zstd -d >/dev/null <"$x"; done
        1.78 ± 0.02 times faster than for x in br/*; do brotli -d >/dev/null <"$x"; done
        6.87 ± 0.05 times faster than for x in xz/*; do xz -d >/dev/null <"$x"; done

As expected, xz is super slow. Gzip is fastest, zstd being somewhat slower, brotli slower again but still much faster than xz.

    +-------+-------+--------+-------+
    | gzip  | zstd  | brotli | xz    |
    +-------+-------+--------+-------+
    | 143ms | 165ms | 255ms  | 982ms |
    +-------+-------+--------+-------+

I honestly expected zstd to win here.