Question I bought a new gpu Biostar Radeon RX550 4GB GDDR5 AND my games are lagging and like sluttering

Jan 3, 2021
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processor:Intel Core i7 3770 3,40 GHz
motherboard :asus h61m-k
bios:american megatrends inc. date 7/21/2014
memory:8gb ddr 3
graphic card: Biostar Radeon RX550 4GB GDDR5
Monitor: am using TV with hdmi cable 1360x768 max resolution 60 HZ MONITOR

i had chipset graphic card before i bought this one and i was playing LoL on like 100 fps smoothly and when i got this graphic card its like i got sluttering and not much more fps but on games like Valorant i got better performance better fps than before but there is sluttering too,i have all drivers and my internet speed is fine,i feel like it was better to play without my gpu bcs i mostly played LoL so help please