Since 4.0 there has been quite a number of people reporting issues with ninjas and heavy lag using mudras and especially with tcj. in many cases making the job completely unplayable at any kind of decent level.
I'm beginning to wonder if this will ever be fixed or acknowledged as there has been no mention of ninja in the job changes or the live letter and it's a bit saddening as it's a job I really like and loved to play in heavensward.
At present though good few people I know and myself have totally benched the job because it's just unplayable with current lag issues and really needs some fixes. especially to TCJ.
most of the time at present I cant even toss a fuma shurikan without it clipping my gcds. would really like to see it fixed