GSAP timeline animation is not smooth

Questions
, ,
1

I applied GSAP animation on my model loaded using FBX loader. It is not smooth if I try to animate the camera position to a very far value let’s say from 2 to 6. This is weird because otherwise it works fine. Example:

//this works smoothly and both property are animated simultaneously-----

let tl = gsap.timeline();
        tl.add('start')
            .to(
                camera.position, {
                x: -3,
                y:4.3,
                z: 2,
                duration: 0.7
            }, 'start'
            )
            .to(camera.rotation, {
                y: 4.1,
                duration: 0.7
            }, 'start'
            )

//But this applies animation in 2 parts and the 2nd one after a little pause(not simultaneous):

let tl = gsap.timeline();
        tl.add('start')
            .to(
                camera.position, {
                x: -6,
                y:6.3,
                z: 3,
                duration: 0.7
            }, 'start'
            )
            .to(camera.rotation, {
                y: 5,
                duration: 0.7
            }, 'start'
            )
2

Please help with this