My pothos has been trailing all over my bookshelf for months and I honestly can't tell if it's thriving or just

My pothos has been trailing all over my bookshelf for months and I honestly can't tell if it's thriving or just... surviving? The leaves look green and healthy enough, but growth feels slow. I'm in a Mediterranean climate so it gets decent light, but I'm wondering if I should be feeding it more or if I'm just being impatient. Anyone else find their pothos grows faster in certain seasons? I'd love to know what actually makes a difference.