SORT performance - slow?

Am I reading this right in that the sort is taking almost 8 seconds?

"GroupAggregate (cost=95808.09..95808.14 rows=1 width=142) (actual time=14186.999..14694.524 rows=315635 loops=1)"
" Output: sq.tag, sq.instrument, s.d1, s.d2, s.d3, s.d4, s.d5, s.d6, s.d7, s.d8, s.d9, s.d10, sum(sq.v)"
" Buffers: shared hit=9763"
" -> Sort (cost=95808.09..95808.09 rows=1 width=142) (actual time=14186.977..14287.068 rows=315635 loops=1)"
" Output: sq.tag, sq.instrument, s.d1, s.d2, s.d3, s.d4, s.d5, s.d6, s.d7, s.d8, s.d9, s.d10, sq.v"
" Sort Key: sq.tag, sq.instrument, s.d1, s.d2, s.d3, s.d4, s.d5, s.d6, s.d7, s.d8, s.d9, s.d10"
" Sort Method: quicksort Memory: 79808kB"
" Buffers: shared hit=9763"
" -> Hash Join (cost=87341.48..95808.08 rows=1 width=142) (actual time=6000.728..12037.492 rows=315635 loops=1)"
" Output: sq.tag, sq.instrument, s.d1, s.d2, s.d3, s.d4, s.d5, s.d6, s.d7, s.d8, s.d9, s.d10, sq.v"
" Hash Cond: (s.scenarioid = sq.scenarioid)"
" Buffers: shared hit=9763"

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