Anyone has a very slow growing maudiae??

[NYCorchidman]

My paph collection is mostly maudiae types.
All of them grow and flower well. Most of them flower twice a year and some seem to be on once a year blooming schedule.

This one particular vini paph I got in bloom in December 2011, has been very slow grower.
June 2012, it started one new fan and so far three leaves. just today I saw a new leaf was poing its tip just barely above the center.
I find this is too slow and unusual for maudiae type.

Anyone else has the same experience?

Maybe I should check this plant for virus that might be slowing it down?

It is Hilo Ruby Double Diamond and Hsinying Glory cross.
The leaves are rather thick and very waxy unlike typical maudiae leaves.

I am keeping this as it is my favorite vini. but been quite frustrating.