To start off, my ping tends to be very low and stay that way during games. I'll try to play when others aren't using the internet and I play with Ethernet. I always feel terrible if I have ping issues because I'm just bringing my team down. Very rarely will I have issues, but the other day I entered a ranked game and had around 450ms delay (my normal is about 46ms). I'm playing Thresh and I'm starting off with a severe disadvantage. I checked every program up on my computer, nothing is downloading, I'm the only one using the internet. It stayed almost exactly 450ms for 30 minutes of the game, and by that time, their ADC was at quite an advantage and we couldn't make a comeback.
Though that's just one example, it's happened to me a few times. My ping is rarely bad enough that I need to check in a custom or practice tool before joining ranked, but having a little counter on the bottom of the client would really help people know if they can safely enter ranked without gambling with Comcast's service every day.
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