This sounds like either your FireTV stick is too old or your TV is.
My LG TV is more than a decade old (non-smart LED TV), the FireTV stick is around 6 years old.
But apart from the FireTV stick (whose remote controls the TV too) taking 15 seconds for a cold start (the TV tends to go to deep sleep mode after idle for long time or when switched off via remote), or 5 seconds for a warm start, the FireTV GUI is quite snappy thereafter (I can briskly move the cursor/selection across icons/thumbnails, menus and apps), till I switch it off again. Netflix, Disney+, Amazon Prime, Discovery+, Apple TV - they all work well on this old setup.
You may want to uninstall some apps on the FireTV stick to give it some breathing space when it runs.
Try the FireTV stick on a PC monitor having HDMI input. If you face same issues there, then it may be time to buy a new FireTV stick or Chromecast, or splurge for a new smart TV.
My LG TV is more than a decade old (non-smart LED TV), the FireTV stick is around 6 years old.
But apart from the FireTV stick (whose remote controls the TV too) taking 15 seconds for a cold start (the TV tends to go to deep sleep mode after idle for long time or when switched off via remote), or 5 seconds for a warm start, the FireTV GUI is quite snappy thereafter (I can briskly move the cursor/selection across icons/thumbnails, menus and apps), till I switch it off again. Netflix, Disney+, Amazon Prime, Discovery+, Apple TV - they all work well on this old setup.
You may want to uninstall some apps on the FireTV stick to give it some breathing space when it runs.
Try the FireTV stick on a PC monitor having HDMI input. If you face same issues there, then it may be time to buy a new FireTV stick or Chromecast, or splurge for a new smart TV.