Rapid flash Phonics

Can you rapid flash using phonics cards with a child turning four? Has anyone had success with this? It seems that some encourage you to slow down the flashing if your child is older? I realize that most ppl started their children very early. Anyone had success with older children. I want my child to obtain speed reading abilities, so I am unsure if I should slow down or keep up the rapid flashing.

Hmmm… I’m not sure. Phonics is very left brain. Maybe you could do both, appeal to both sides of the brain. Flash phonics flashcards fast, and then do more sit down phonic activities like Hooked on Phonics, or Phonics Pathway.
But I’m not an expert, just an idea. I’d love to hear other members ideas.