Enigma2 boxes are not ideally made for iptv. But we make them work. All IPTV probably plays better on an android device.
Your box is 5 years old, santa is coming soon. Consider a quad core box.
What makes your line stutter?
Overloaded provider server.
Slow internet
VPNs will slow an internet down even more. And lots of VPNs are also getting overloaded and becoming crap.
Provider upping the quality of his streams and your box not being able to handle it
Providers getting hammered when football is on, as everyone is stuck in their homes.
Your box might be running out of memory. You have wooshbuild installed. Wooshbuild is bloaty.
Try a few different iptv trials, see if your provider is crap or your box is crap or your internet is crap :)