Very slow move of task - by: QUANTAMEDICAL

Hello team,

I have a project with hundreds of task, when i want to change parent of ONE task, it spend 7 minutes.
Nothing work on this server at this time, 4 core, 8 Go, Centos last version, Mysql and Php last version distributed

Is there any possibility to speed this.
We use this solution since a year, now, but lost of time is realy a disadvantage particulary on this type of change, when we want to reorganise project content

Thanks