Yes her portal and phase speed was nerfed and it wasn`t in the patch notes.
This is her actual speed numbers:
In season 4, her Portal Speed was 418.60, way more if you slide jump and so on.
Your tactical alone increase your speed to 327.14, and if its a during your ultimate, your speed becomes - 446,74.
In Season 5 they actually lower it more, now its less during portal and phase. Its 364 in her portal and 284,47 during phase. If you are using her phase during portal its 388.47.
Normal holstered speed is 299, so during her portal right now, its around 22% increase.
In season 4, her speed increase was 50% more, which was absurd.
I think that she needs a speed buff to her portal, but season 4 the % was too big. Don`t know if 364 right now is in that sweet spot tho.
We actually don`t know how Respawn feel for that and what is their view for her portal. They may think that she needs a slight speed boost so she can dodge and weave better during her portal and makes her harder to hit, but not to be used as a self escape mechanism, aka season 4 50% boost and no regular legend to be able to chase you during your portal.
Have in mind that your speed increase more when you slide jump and so on.
But yeah this is another hidden nerf to Wraith.