The 1050ti may be the newest addition to your system but for a higher framerate it can be a bottleneck.
At 1080p for instance the 1050ti will run Rise of the Tomb Raider at an average of 43.7 frames per second on very high settings. A 1060 will do the same settings at 74.2.
Digital Foundry has done a test on the current line of Nvidia cards.
To improve gaming performance with the current card, you'll have to tweak the settings of each game and turn down some of the details. Or alternatively use the GeForce Experience software's predefined profiles for popular titles.