I almost exclusively read in English, but it is not my native language and - same as you - I’m reading on a slightly slower pace than when reading in my native one. I think it’s completely normal to read slower if it’s not your native language. (Also shoutout to you for not seeing reading as a competition. I have to remind myself of that often enough when seeing others, mostly native speakers, flying through mindblowing amount of books.) As long as you have fun, everything is fine 😊