Performance improvements suggested

Analysis shows that WES + CWL is around 10 seconds slower that CWL alone:

hyperfine 'cwltool dbfetch.cwl  --dbName sp --id wap_rat,wap_pig --method fetchBatch --outFormat fasta'
Benchmark #1: cwltool dbfetch.cwl  --dbName sp --id wap_rat,wap_pig --method fetchBatch --outFormat fasta

  Time (mean ± σ):      3.788 s ±  0.144 s    [User: 1.819 s, System: 0.210 s]

  Range (min … max):    3.640 s …  4.067 s

The above command is executed in my machine and uses the Docker as default container runner.

hyperfine './wes_request.sh'
Benchmark #1: ./wes_request.sh

  Time (mean ± σ):     13.409 s ±  1.961 s    [User: 6.681 s, System: 3.073 s]

  Range (min … max):   12.023 s … 17.907 s

wes_request.sh does a POST request and 'polls' (no delay) for the status of the job until completed.