diff --git a/__init__.py b/__init__.py
index 7f673af030..9eafa7a675 100755
--- a/__init__.py
+++ b/__init__.py
@@ -118,9 +118,9 @@ def import_sverchok():
 
 @profiling_startup("reg_stats")
 def register():
-    from sverchok.core import sv_registration_utils
+    from sverchok.core import sv_register_modules
     import sverchok
-    sv_registration_utils.register_all(imported_modules + node_list)
+    sv_register_modules(imported_modules + node_list)
     sverchok.core.init_bookkeeping(__name__)
 
     if reload_event:
@@ -130,10 +130,10 @@ def register():
 
 def unregister():
     import sverchok
-    from sverchok.core import sv_registration_utils
+    from sverchok.core import sv_unregister_modules
 
     sverchok.utils.clear_node_classes()
-    sv_registration_utils.unregister_all(imported_modules)
-    sv_registration_utils.unregister_all(node_list)
+    sv_unregister_modules(imported_modules)
+    sv_unregister_modules(node_list)
 
 # EOF
diff --git a/core/__init__.py b/core/__init__.py
index 1196755349..515174dc4e 100644
--- a/core/__init__.py
+++ b/core/__init__.py
@@ -1,6 +1,5 @@
 import importlib
-import sverchok
-from sverchok.core.socket_data import clear_all_socket_cache
+
 
 root_modules = [
     "node_tree", "data_structure", "core",
@@ -26,7 +25,6 @@ def sv_register_modules(modules):
 
 
 def sv_unregister_modules(modules):
-    clear_all_socket_cache()
     for m in reversed(modules):
         if hasattr(m, "unregister"):
             try:
@@ -36,23 +34,6 @@ def sv_unregister_modules(modules):
                 print(str(e))
 
 
-def sv_registration_utils():
-    """ this is a faux module for syntactic sugar on the imports in __init__ """
-    pass
-
-
-sv_registration_utils.register_all = sv_register_modules
-sv_registration_utils.unregister_all = sv_unregister_modules
-
-
-def reload_all(imported_modules, node_list):
-    # reload base modules
-    _ = [importlib.reload(im) for im in imported_modules]
-
-    # reload nodes
-    _ = [importlib.reload(node) for node in node_list]
-
-
 def make_node_list(nodes):
     node_list = []
     base_name = "sverchok.nodes"
@@ -70,13 +51,21 @@ def import_modules(modules, base, im_list):
 
 def handle_reload_event(nodes, imported_modules):
     node_list = make_node_list(nodes)
-    reload_all(imported_modules, node_list)
+
+    # reload base modules
+    for module in imported_modules:
+        importlib.reload(module)
+
+    # reload nodes
+    for node in node_list:
+        importlib.reload(node)
     return node_list
 
 
-def import_settings(imported_modules, sv_dir_name):
-    # "settings" treated separately in case the sverchok dir isn't named "sverchok"
-    settings = importlib.import_module(".settings", sv_dir_name)
+def import_settings(imported_modules):
+    """Useful have the function to be sure that we do not import half of
+    Sverchok modules wia settings"""
+    settings = importlib.import_module(".settings", "sverchok")
     imported_modules.append(settings)
 
 
@@ -95,7 +84,7 @@ def init_architecture(sv_name, utils_modules, ui_modules):
         (ui_modules, "sverchok.ui")
     ]
     print('sv: import settings')
-    import_settings(imported_modules, sv_name)
+    import_settings(imported_modules)
     print('sv: import all modules')
     import_all_modules(imported_modules, mods_bases)
     return imported_modules
@@ -104,17 +93,18 @@ def init_architecture(sv_name, utils_modules, ui_modules):
 def init_bookkeeping(sv_name):
 
     from sverchok.utils import ascii_print, auto_gather_node_classes
+    from sverchok import data_structure, nodes
 
-    sverchok.data_structure.SVERCHOK_NAME = sv_name
+    data_structure.SVERCHOK_NAME = sv_name
     ascii_print.show_welcome()
-    auto_gather_node_classes()
+    auto_gather_node_classes(nodes)
 
 
-activation_message = """\n
-** Sverchok needs a couple of seconds to become activated when you enable it for the first time. **
-** Please restart Blender and enable it by pressing the tick box only once -- be patient!        ** 
-"""
 def interupted_activation_detected():
+    activation_message = """\n
+    ** Sverchok needs a couple of seconds to become activated when you enable it for the first time. **
+    ** Please restart Blender and enable it by pressing the tick box only once -- be patient!        ** 
+    """
     return NameError(activation_message)
 
 
diff --git a/core/handlers.py b/core/handlers.py
index 6871968795..c89495ff40 100644
--- a/core/handlers.py
+++ b/core/handlers.py
@@ -12,6 +12,7 @@
 from sverchok.utils import app_handler_ops
 from sverchok.utils.handle_blender_data import BlTrees
 from sverchok.utils.logging import catch_log_error, debug
+import sverchok.settings as settings
 
 _state = {'frame': None}
 
@@ -216,9 +217,11 @@ def call_user_functions_on_post_load_event(scene):
         function()
 
 
+settings.set_frame_change = set_frame_change
+
+
 def register():
     app_handler_ops(append=handler_dict)
-    data_structure.setup_init()
 
     update_frame_change_mode()
     bpy.app.handlers.load_post.append(call_user_functions_on_post_load_event)
diff --git a/core/socket_data.py b/core/socket_data.py
index 7271d3844c..e0ed72a7a6 100644
--- a/core/socket_data.py
+++ b/core/socket_data.py
@@ -215,3 +215,7 @@ def clear_all_socket_cache():
     Reset socket cache for all node-trees.
     """
     socket_data_cache.clear()
+
+
+def unregister():
+    clear_all_socket_cache()
diff --git a/data_structure.py b/data_structure.py
index 4ea974c6ff..2167a2de31 100755
--- a/data_structure.py
+++ b/data_structure.py
@@ -40,7 +40,6 @@
 import numpy as np
 
 
-DEBUG_MODE = False
 RELOAD_EVENT = False
 
 # this is set correctly later.
@@ -1203,35 +1202,6 @@ def extend_blender_class(cls):
     return cls
 
 
-#####################################################
-############### debug settings magic ################
-#####################################################
-
-
-def sverchok_debug(mode):
-    """
-    set debug mode to mode
-    """
-    global DEBUG_MODE
-    DEBUG_MODE = mode
-    return DEBUG_MODE
-
-
-def setup_init():
-    """
-    setup variables needed for sverchok to function
-    """
-    global DEBUG_MODE
-    global SVERCHOK_NAME
-    import sverchok
-    SVERCHOK_NAME = sverchok.__name__
-    addon = bpy.context.preferences.addons.get(SVERCHOK_NAME)
-    if addon:
-        DEBUG_MODE = addon.preferences.show_debug
-    else:
-        print("Setup of preferences failed")
-
-
 #####################################################
 ############### update system magic! ################
 #####################################################
diff --git a/dependencies.py b/dependencies.py
index 9cc9e3b5fd..4bb38c5843 100644
--- a/dependencies.py
+++ b/dependencies.py
@@ -25,10 +25,12 @@
 """
 
 import logging
+import sverchok.settings as settings
 
 # Logging setup
 # we have to set up logging here separately, because dependencies.py is loaded before settings.py,
 # so we can't use common settings.
+# todo it's not True any more - can be refactored
 
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.INFO)
@@ -189,3 +191,9 @@ def draw_message(box, package, dependencies=None):
     info("sv: Dependencies available: %s.", ", ".join(good_names))
 else:
     info("sv: No dependencies are available.")
+
+settings.pip = pip
+settings.sv_dependencies = sv_dependencies
+settings.ensurepip = ensurepip
+settings.draw_message = draw_message
+settings.get_icon = get_icon
diff --git a/settings.py b/settings.py
index 6d407a9e2e..6ecc98fca5 100644
--- a/settings.py
+++ b/settings.py
@@ -5,21 +5,25 @@
 import bpy
 from bpy.types import AddonPreferences
 from bpy.props import BoolProperty, FloatVectorProperty, EnumProperty, IntProperty, FloatProperty, StringProperty
-from sverchok.dependencies import sv_dependencies, pip, ensurepip, draw_message, get_icon
-from sverchok import data_structure
-from sverchok.core import tasks # don't remove this should fix #4229 (temp solution)
-from sverchok.core import handlers
-from sverchok.utils import logging
-from sverchok.utils.sv_gist_tools import TOKEN_HELP_URL
-from sverchok.utils.sv_extra_addons import draw_extra_addons
-from sverchok.ui import color_def
+
 from sverchok.ui.utils import message_on_layout
 
+"""Don't import other Sverchok modules here"""
+
 if bpy.app.version >= (2, 91, 0):
     PYPATH = sys.executable
 else:
     PYPATH = bpy.app.binary_path_python
 
+
+# names from other modules
+sv_dependencies, pip, ensurepip, draw_message, get_icon = [None] * 5
+set_frame_change = None
+info, setLevel = [None] * 2
+draw_extra_addons = None
+apply_theme, rebuild_color_cache, color_callback = [None] * 3
+
+
 def get_params(prop_names_and_fallbacks, direct=False):
     """
     This function returns an object which you can use the . op on.
@@ -74,18 +78,17 @@ def get_param(prop_name, fallback):
 
 def apply_theme_if_necessary():
     if get_param("apply_theme_on_open", False):
-        color_def.apply_theme()    
+        apply_theme()
         print("applied theme.")
 
 # getDpiFactor and getDpi are lifted from Animation Nodes :)
 
-def get_dpi_factor():
-    return get_dpi() / 72
+def get_dpi_factor(factor=0.014):
+    system_preferences = bpy.context.preferences.system
+    retina_factor = getattr(system_preferences, "pixel_size", 1)
+    dpi = system_preferences.dpi * retina_factor
+    return dpi * factor
 
-def get_dpi():
-    systemPreferences = bpy.context.preferences.system
-    retinaFactor = getattr(systemPreferences, "pixel_size", 1)
-    return systemPreferences.dpi * retinaFactor
 
 class SvExPipInstall(bpy.types.Operator):
     """Install the package by calling pip install"""
@@ -181,21 +184,19 @@ def execute(self, context):
         return {'FINISHED'}
 
 class SverchokPreferences(AddonPreferences):
-
-    bl_idname = __package__
-
-    def update_debug_mode(self, context):
-        data_structure.DEBUG_MODE = self.show_debug
+    import sverchok
+    bl_idname = sverchok.__name__
 
     def set_frame_change(self, context):
-        handlers.set_frame_change(self.frame_change_mode)
+        set_frame_change(self.frame_change_mode)
 
     def update_theme(self, context):
-        color_def.rebuild_color_cache()
+        rebuild_color_cache()
         if self.auto_apply_theme:
-            color_def.apply_theme()
+            apply_theme()
 
-    tab_modes = data_structure.enum_item_4(["General", "Node Defaults", "Extra Nodes", "Theme"])
+    tab_modes = [(n.replace(' ', '_'), n, '', i) for i, n in
+                 enumerate(["General", "Node Defaults", "Extra Nodes", "Theme"])]
 
     selected_tab: bpy.props.EnumProperty(
         items=tab_modes,
@@ -203,13 +204,6 @@ def update_theme(self, context):
         default="General"
     )
 
-    #  debugish...
-    show_debug: BoolProperty(
-        name="Debug mode",  # todo to remove, there is logging level for this
-        description="Deprecated",
-        default=False, subtype='NONE',
-        update=update_debug_mode)
-
     no_data_color: FloatVectorProperty(
         name="No data", description='When a node can not get data',
         size=3, min=0.0, max=1.0,
@@ -239,12 +233,16 @@ def update_theme(self, context):
             default = False)
 
     #  theme settings
+    themes = [("default_theme", "Default", "Default"),
+              ("nipon_blossom", "Nipon Blossom", "Nipon Blossom"),
+              ("grey", "Grey", "Grey"),
+              ("darker", "Darker", "Darker")]
 
     sv_theme: EnumProperty(
-        items=color_def.themes,
+        items=themes,
         name="Theme preset",
         description="Select a theme preset",
-        update=color_def.color_callback,
+        update=color_callback,
         default="default_theme")
 
     auto_apply_theme: BoolProperty(
@@ -360,8 +358,8 @@ def set_nodeview_render_params(self, context):
     # Logging settings
 
     def update_log_level(self, context):
-        logging.info("Setting log level to %s", self.log_level)
-        logging.setLevel(self.log_level)
+        info("Setting log level to %s", self.log_level)
+        setLevel(self.log_level)
 
     log_levels = [
             ("DEBUG", "Debug", "Debug output", 0),
@@ -416,7 +414,7 @@ def general_tab(self, layout):
         box.label(text="Export to Gist")
         box.prop(self, "github_token")
         box.label(text="To export node trees to gists, you have to create a GitHub API access token.")
-        box.label(text="For more information, visit " + TOKEN_HELP_URL)
+        box.label(text="For more information, visit " + "https://github.com/nortikin/sverchok/wiki/Set-up-GitHub-account-for-exporting-node-trees-from-Sverchok")
         box.operator("node.sv_github_api_token_help", text="Visit documentation page")
 
         col2 = col_split.split().column()
@@ -426,7 +424,6 @@ def general_tab(self, layout):
 
         col2box = col2.box()
         col2box.label(text="Debug:")
-        col2box.prop(self, "show_debug")
         col2box.prop(self, "developer_mode")
 
         log_box = col2.box()
diff --git a/ui/color_def.py b/ui/color_def.py
index d5f465cea7..2939f34c2b 100644
--- a/ui/color_def.py
+++ b/ui/color_def.py
@@ -20,6 +20,7 @@
 import bpy
 from bpy.props import StringProperty
 
+import sverchok.settings as settings
 from sverchok.utils.logging import debug
 import sverchok
 from sverchok.utils.handle_blender_data import BlTrees
@@ -27,11 +28,6 @@
 
 colors_cache = {}
 
-themes = [("default_theme", "Default", "Default"),
-          ("nipon_blossom", "Nipon Blossom", "Nipon Blossom"),
-          ("grey", "Grey", "Grey"),
-          ("darker", "Darker", "Darker")]
-
 
 default_theme = {
     "Viz": (1, 0.589, 0.214),
@@ -169,3 +165,8 @@ def register():
 
 def unregister():
     bpy.utils.unregister_class(SverchokApplyTheme)
+
+
+settings.apply_theme = apply_theme
+settings.rebuild_color_cache = rebuild_color_cache
+settings.color_callback = color_callback
diff --git a/utils/__init__.py b/utils/__init__.py
index a3e361f0be..060c97a5f2 100644
--- a/utils/__init__.py
+++ b/utils/__init__.py
@@ -1,6 +1,6 @@
 # GPL3
 import bpy
-import sverchok
+import inspect
 
 node_classes = {}
 
@@ -59,17 +59,13 @@ def unregister():
 
         return register, unregister
 
-def auto_gather_node_classes(start_module = None):
+
+def auto_gather_node_classes(start_module):
     """
     this produces a dict with mapping from bl_idname to class reference at runtime
     f.ex
           node_classes = {SvBMeshViewerMk2: <class svechok.nodes.viz ......> , .... }
     """
-
-    import inspect
-    if start_module is None:
-        start_module = sverchok.nodes
-
     node_cats = inspect.getmembers(start_module, inspect.ismodule)
     for catname, nodecat in node_cats:
         node_files = inspect.getmembers(nodecat, inspect.ismodule)
diff --git a/utils/logging.py b/utils/logging.py
index 345b9f38dc..67db7bfe4f 100644
--- a/utils/logging.py
+++ b/utils/logging.py
@@ -11,6 +11,7 @@
 import sverchok
 from sverchok.utils.development import get_version_string
 from sverchok.utils.context_managers import sv_preferences
+import sverchok.settings as settings
 
 # Hardcoded for now
 log_format = "%(asctime)s [%(levelname)s] %(name)s: %(message)s"
@@ -262,6 +263,8 @@ def is_enabled_for(log_level="DEBUG") -> bool:
 consoleHandler = None
 
 logger = logging.getLogger("logging")
+settings.info = info
+settings.setLevel = setLevel
 
 def register():
     global consoleHandler
diff --git a/utils/sv_extra_addons.py b/utils/sv_extra_addons.py
index 411b5d93fe..7c9cbb58d2 100644
--- a/utils/sv_extra_addons.py
+++ b/utils/sv_extra_addons.py
@@ -15,16 +15,14 @@
 #  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 # ##### END GPL LICENSE BLOCK #####
-import bpy
+
 import os
-import urllib
-import urllib.request
 from zipfile import ZipFile
 import addon_utils
 
 
 import bpy
-import sverchok
+import sverchok.settings as settings
 from sverchok.utils import sv_requests as requests
 
 
@@ -172,6 +170,8 @@ def execute(self, context):
         return {'FINISHED'}
 
 
+settings.draw_extra_addons = draw_extra_addons
+
 
 def register():