Results (both at 240 nodes view, set by minetest itself):
0.4.4 - 48 FPS
0.4.13 - 40 FPS
So we have -8 FPS drop or -17% in MT 0.4.13. :( Don't forget that 0.4.4 got not only better FPS but it is much smoother in general (without jitter/stutter), 0.4.13 got sometimes some limited jittering (stuttering) while walking.
Config, 0.4.4:
Spoiler
anisotropic_filter = 1
bilinear_filter = 0
creative_mode = 0
enable_3d_clouds = 1
enable_damage = 1
enable_shaders = 2
mip_map = 1
name = Fixer_
new_style_leaves = 1
opaque_water = 0
port = 30401
preload_item_visuals = 1
selected_mainmenu_tab = 3
smooth_lighting = 1
trilinear_filter = 0
fast_move = false
free_move = false
Spoiler
bilinear_filter = false
connected_glass = false
enable_bumpmapping = false
enable_parallax_occlusion = false
enable_waving_leaves = false
enable_waving_plants = false
enable_waving_water = false
fsaa = 0
generate_normalmaps = false
leaves_style = fancy
maintab_LAST = settings
menu_last_game = minetest
mip_map = true
name = Fixer
server_dedicated = false
trilinear_filter = false
language = en
cinematic = false
creative_mode = true
fixed_map_seed =
free_move = false
mainmenu_last_selected_world = 2
mg_name = v7
public_serverlist = true
address = minetest.org
remote_port = 30006
enable_minimap = true
minimap_shape_round = false
sound_volume = 0.5
fast_move = false
noclip = false
selected_world_path = D:\Games\Minetest\minetest-stable\bin\..\worlds\CarboWorld
world_config_selected_mod = 1
enable_damage = true
server_announce = false
enable_particles = false