Is my reading progress too slow? Stuck on the Tamil script

I’ve been at it for three weeks, and I feel like I’m still sounding out every single character like a primary school student. I keep bouncing between apps, but none of them seem to help me get past the 'decoding' stage to actual reading flow. Should I stick to transliteration for a while longer, or will that just make it harder to learn the Tamil script properly in the long run?