@Badjester 

Yup, I'm having same issue.  Sometimes it doesn't connect at all and I have to go out of live feed and back in... but then still takes 10-15 seconds 

@Lauranator I did find a partial solution and that is to go into settings within the camera and pick advanced. Then unselect the hardware acceleration. It's not explained what this is fully but it does speed things up when viewing live a bit. It's still slower than I would expect but it's the only part fix I've found.

@Lauranator yes it's a shame and sadly TP Link customer service are absolutely terrible. They always try to blame "router settings" etc. I had to cut the online chat short when I told him I was NOT going to start messing about with my router as it's a camera/app issue! My Tapo cams which had less features worked perfectly. Might go back to them but they don't have sound detection which I really want.

@Badjester Did anyone ever help resolve this for you? I have not had lag issues for about year now but just in the last few weeks all of my cameras have a bad lag time! Most of my cameras are KC120's. 

@Cam_fan  No, I have contacted TP Link support about this a while back. To be totally honest... TP Link products when they work are great. If you need to contact support that's when you realise they're pathetic at helping customers. That's if they ever bother getting back. The chat advisor I spoke to started trying to go down the road of "router settings." I've had this before with them. It's clearly got nothing to do with router settings but he wouldn't listen so I said I wasn't wasting my time. I have noticed the load time for live viewing has coincidentally improved since then. However I now have an issue with both cameras dropping out and losing connection (LEDs flashing.) No idea what that's about. I've tried resetting, I tried off and on. This time I did reset/reboot my router but they still intermittently lose connection. I'm thinking of just getting different cams from a different brand.

@Solla-topee Hi, one has 4 out of 5 bars of signal and shows -54dBm and the other shows 5 out of 5 bars of signal and is -30dBm so they both have good signal. That's because they are both within 10 feet from the router. As for the email I received with the many many things to try to resolve the issue. I've been through the exact same process before and answered all the questions previously and the advisor then started asking me to change router settings which I am NOT up for doing as it's not my router. My router is a Sky Q Hub capable of 2.4 and 5GHz. I've had the NC450 and C200 cameras before these and they worked fine. My LB130 and KL130B bulbs work fine. My smart plugs too. It's literally since I bought the KC115 cameras that I've had trouble with them. The live feed issue seems to be improved since I posted this thread but the disconnection issues are a problem. I've reset the cameras and it doesn't help. As I say I've answered all the questions in the email you sent before with a TP Link advisor. I've even reset my router on one occasion and nothing seems to sort the issue out permanently. The connection problem is intermittent as sometimes they work for a good few days then suddenly they start dropping out again. I have previously checked a WiFi analyser app and all seemed fine. However I just don't have enough spare hours in a day to keep faffing around with them like this! It's pretty obvious the issue is at TP Links end and not mine.