Performance typically refers to being able to utilize your physical capacities to accomplish certain tasks with a high degree of efficacy.
In simpler words it means that your body is able to "do stuff" (as opposite to aesthetic training which simply refers to looking lean and muscular without any need to be good at using the body you have).
Now "doing stuff" is quite broad. When you are a competitive athlete you sport narrows down the physical capacity you need since performance becomes: "being able to use your physical capacities to perform optimally in your sport".
But when you are an average Joe you don't have a precise criteria for what you want to perform at.
So you either need to create your own ideal model OR go for a middle ground approach of being decent in all the basic physical capacities.
Strength is important and is a fondamental/foundational physical capacity. As such it does need to be developed. But simply being strong doesn't necessarily make you into a high performance human. If you are super strong but have lousy mobility preventing you from doing many athletic movement, or if you have such bad endurance/resistance that you get winded after 45 seconds of effort can you really claim to be a high performance machine (keep in mind that you don't have precise tasks you need to be good at).
As a "weights" guy, performance on strength and power activities are more important to me than endurance ones. So I value not only strength but also power/explosiveness and agility. I also value mobility since I want to be able to use my power/strength on any movement without being restricted by my mobility.
FOR ME performance is about being decently strong on both the slow (deadlift, bench, squat, overhead press, etc.) and quick (snatch, clean, jerk, push press, etc.) lifts. Be able to sprint fast. jump high and move quickly. I also want to have enough mobility to be able to do all of these without any restriction and I want enough conditioning to be able to do these exercises without fatigue affecting my performance.
People who are more slanted toward endurance sports will have a different view of "performance", obviously.