Weird speed issue

I have an 880,000 line XML file. I wrote some code, in C#, in DevStudio to process it. Takes 0.6 seconds.

Drop it straight into Unity, takes over a minute whether in editor, or if I build and run as a PC exe.

I run it on mobile, it takes 8 seconds on a Samsung S6. On iPhone 5, takes 11 seconds.

I load the whole thing into memory (30Meg file) and use a memorystream to process through it.

Seems very odd to me, my desktop has a lot more grunt than my mobiles. Especially as it works fine when built in DevStudio.

 

What does a deep profile say.