Major FitNesse issues

Hello all,
I have major issues with FitNesse while trying to run tests suite and individual tests.
1) almost all my tests iterations are broken by errors. Mostly :
- timeouts
- Working... remained for longer than timeout period, investigate performance and test timeout parameter.
- Bad table! Table has X header columns, but row Y only has Z columns.
When I execute test scenarios without FitNesse, I don't meet any issue. Basically, that means that it doesn't fulfill its purpose...

2) When I launch a test suite, test pages don't execute in order. They skip 5 test pages ! Here is the test suite page configuration I use :

|Sirocco Tests script |
|[[Reinitialiser Affaire][.Sirocco.ReinitialiserAffaire]] |''Permet de réinitialiser une Affaire Sirocco et Choisir le chantier actif''|
|[[Etape Préparation: Enregistrement de l'affaire][.Sirocco.TestEtapePreparation.EnregistrementAffaire]]|''Enregistrement de l'affaire'' |
|[[Et...

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