GROUP_CONCAT slow in MySQL -

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i have following query in mysql:

select query.*,   group_concat(coalesce(query.gene,'none'), '(', query.loc, '|', coalesce(query.typ,'unknown'), ')') outt (   select genes.loc,   genes.typ, genes.abans, genes.despres, genes.gene,    mutations.id,mutations.chr,mutations.pos,mutations.ref,   mutations.ale,mutations.g001,mutations.g002,mutations.g003,   .... (snipped hundreds of denormalized fields)....   genes   inner join mutations   on genes.id=mutations.id   (mutations.g001>=0.40      , mutations.g002>=0.40 , mutations.g003>=0.40      , mutations.g004>=0.40 , mutations.g005>=0.40      , mutations.g006>=0.40 , mutations.g007>=0.40      , mutations.g008>=0.40 , mutations.g011>=0.40       , mutations.g012>=0.40 , mutations.g013>=0.40       , mutations.g014>=0.40 , mutations.g015>=0.40       , ....(you idea)...     , mutations.g105>=0.40   ) limit 0, 100 ) query  group query.id

i group_concat in query , works quite well. problem want 100 rows, while less 100 rows due group by. when trying apply group_concat directly inner query, extremely slow. have suggestions?


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