V7.1.4 : Modify activity (delete,project,..)

Hello,

I have a php timeout after 10 minutes when on activity when i try to delete or change project.

Apache log:
[Thu Sep 20 10:38:02.567549 2018] [:error] [pid 19744] [client 192.168.216.117:51913] PHP Fatal error: Maximum execution time of 600 seconds exceeded in /var/www/projectorria/model/persistence/SqlElement.php on line 2989, referer: https://project.maxxing.com/view/main.php

Mysql log: no error

sample of action to reproduce:
- I try to delete an activity on main project.
- I try to move an activity from main project to sub project.

server is dedicated , nothing run at this time, maybe the problem is due to wbs update because i don't have this problem on ticket

Here is the structure of the branch

MAIN PROJECT WBS:153 TICKET:1418 ACTIVITE:850
--> CORE WBS:153.1 TICKET:73 ACTIVITE:67
--> PROMOTION WBS:153.2 TICKET:260 ACTIVITE:134
--> CUSTOMER WBS:153.3 TICKET:87 ACTIVITE:49
--> TARGETING WBS:153.4 TICKET:30 ACTIVITE:41
--> MASSCOM WBS:153.5 TICKET:19 ACTIVITE:30
--> MOBILITY WBS:153.137 TICKET:14 ACTIVITE:70
--> DOCUMENT WBS:153.781 TICKET:1 ACTIVITE:1
--> STANDARD DOCUMENTATION WBS:153.782 TICKET:3 ACTIVITE:1
--> OUTILS INTERNES WBS:153.783 TICKET:16 ACTIVITE:22
--> MIGRATION VX WBS:153.784 TICKET:2 ACTIVITE:14
--> FID WBS:153.785 TICKET:0 ACTIVITE:0
--> ENGINE WBS:153.786 TICKET:1 ACTIVITE:4
--> MANAGEMENT WBS:153.787 TICKET:39 ACTIVITE:41
--> CLOUD WBS:153.798 TICKET:1 ACTIVITE:19

I can't reorganize this project , could you help me to solve the problem ?

Thanks