If you are on an ATi Radeon card at least, try disabling "Triple Buffering" under the 3D settings -->> Open Gl settings for the driver in the Catalyst Control Center. Also, for "Wait for Vertical Refresh," I set this value to "Off, unless application specifies" I am using a 1gb HD4870 and wasn't expecting to run into this issue on a game like Minetest considering this card can push 1.2 teraflops of processing power. Apparently there is some kind of conflict with this setting and Minetest, however, because even at 60 fps, I still had slight jittering, especially when generating blocks or increasing the viewing range, not only would my frame rate plummet, but also, it would become nearly unplayable with constant hitching and freezing. After disabling this setting the game is 10 times smoother on the exact same, fully generated map. between 30 and 60 fps with a viewing range of 350 isn't bad at all. Funny... considering triple buffering is only supposed to be active during enabled vsync but that's what fixed it for me. Good luck!
-Badger436
PS: This may work with nVidia cards if you are having a similar problem, but I am not familiar with their drivers.
Here is my Minetest.conf:
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anisotropic_filter = 1
bilinear_filter = 0
creative_mode = 1
enable_3d_clouds = 1
enable_damage = 1
enable_particles = 1
enable_shaders = 2
mip_map = 1
name = Badger436
new_style_leaves = 1
opaque_water = 0
port = 30000
preload_item_visuals = 1
selected_mainmenu_tab = 0
smooth_lighting = 1
trilinear_filter = 0
vsync = false
