XD prototypes are extremely slow

Hello,
I am using small XD prototypes for user testing.
Prototypes run fine when played form XD software, but when played on any laptop/ phone browser using links, are extremely inconstant and slow at times.

I tried test micro interactions with few XD prototypes using user testing, it was utter failure because when users viewed the prototypes the desired effect was just not there because of laggyness and unpredictable behaviour of prototypes. 

I cannot control test users devices/ browsers or anything else. I expect a prototype to run the way it’s designed. So far it’s been a failure. 
😞