If it's becoming tiresome to read u're always free to drop this, no need to force urself to read something u think is torturing u while reading.
As for me i don't mind the dragging so long as they give us more details about the other aspects of the story of why Gardeners and Otherworlders exist... I don't read this for her "One Punch Man" Strength, i read this for how she'll make friends despite her rock-bottom social skills and be Normal while having such strength. This is the only manga i read anyway, don't have much time for other series nowadays.