# Performance and running time of classify-consensus-blast+

**URL:** https://forum.qiime2.org/t/performance-and-running-time-of-classify-consensus-blast/1984
**Category:** User Support
**Tags:** taxonomy, feature-classifier, paired-end
**Created:** [November 27, 2017, 2:19pm UTC](https://forum.qiime2.org/t/performance-and-running-time-of-classify-consensus-blast/1984 "2017-11-27T14:19:00Z")
**Posts on this page:** 1
**Showing post:** 11

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### Author: ![Nicholas\_Bokulich](https://forum.qiime2.org/user_avatar/forum.qiime2.org/nicholas_bokulich/32/19937_2.png) [@Nicholas\_Bokulich](https://forum.qiime2.org/u/Nicholas_Bokulich)
#### Post date: [December 4, 2017, 4:32pm UTC](https://forum.qiime2.org/t/performance-and-running-time-of-classify-consensus-blast/1984/11 "2017-12-04T16:32:37Z")

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Hi @steff1088,  
Your workflow looks correct to me; there is also a community tutorial on OTU picking [here](https://forum.qiime2.org/t/clustering-sequences-into-otus-using-q2-vsearch/1348) that may be useful in case you have not already seen it.

> [@steff1088](#):
>
> I am running subsets to test the workflow first

❤

> [@steff1088](#):
>
> Could I theoretically use taxa barplot here already along with SILVA’s otu.qza as taxonomy file?

I think not, since this is open reference and many of the OTUs will have no associated SILVA ID/taxon. If you used closed reference, that should be possible.

> [@steff1088](#):
>
> Then, I reformatted this file (.tsv) and used it as input for the qiime feature-table filter-seqs command resulting in a filtered sequence file

You are using the currently recommended workaround but just FYI soon that feature table could be passed to `filter-seqs` directly. See[this issue](https://github.com/qiime2/q2-feature-table/issues/152) to track progress.

> [@steff1088](#):
>
> Here I used for both commands the clustered table and sequence file from the open-reference clustering, is that right?

correct

> [@steff1088](#):
>
> As reference read inputs I used the otu.qza file as in the cluster step.

Yes, as long as these OTUs correspond to the `16Sonly_consensus_taxonomy_7_levels.qza`.

> [@steff1088](#):
>
> To move on, I would basically use the output taxonomy and the filtered feature table file to make taxa barplot, correct?

Correct! and all other downstream analyses.

I hope that helps! Let us know if you run into any trouble (probably in a separate thread).

Happy QIIMEing 🌞

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