diff --git a/gns3server/api/routes/compute/docker_nodes.py b/gns3server/api/routes/compute/docker_nodes.py
index 1d9e98530..3e30628a2 100644
--- a/gns3server/api/routes/compute/docker_nodes.py
+++ b/gns3server/api/routes/compute/docker_nodes.py
@@ -235,6 +235,7 @@ async def delete_docker_node(node: DockerVM = Depends(dep_node)) -> None:
     """
 
     await node.delete()
+    await node.project.remove_node(node)
 
 
 @router.post(
diff --git a/gns3server/compute/docker/docker_vm.py b/gns3server/compute/docker/docker_vm.py
index 5219ad4c8..988d61cf3 100644
--- a/gns3server/compute/docker/docker_vm.py
+++ b/gns3server/compute/docker/docker_vm.py
@@ -511,8 +511,18 @@ class DockerVM(BaseNode):
             variables = []
 
         for var in variables:
-            formatted = self._format_env(variables, var.get("value", ""))
-            params["Env"].append("{}={}".format(var["name"], formatted))
+            # Handle both Pydantic Variable objects and dictionaries
+            if hasattr(var, "name"):
+                # Pydantic Variable object
+                var_name = var.name
+                var_value = getattr(var, "value", "")
+            else:
+                # Dictionary format
+                var_name = var.get("name", "")
+                var_value = var.get("value", "")
+
+            formatted = self._format_env(variables, var_value)
+            params["Env"].append("{}={}".format(var_name, formatted))
 
         if self._environment:
             for e in self._environment.strip().split("\n"):
@@ -581,7 +591,17 @@ class DockerVM(BaseNode):
 
     def _format_env(self, variables, env):
         for variable in variables:
-            env = env.replace("${" + variable["name"] + "}", variable.get("value", ""))
+            # Handle both Pydantic Variable objects and dictionaries
+            if hasattr(variable, "name"):
+                # Pydantic Variable object
+                var_name = variable.name
+                var_value = getattr(variable, "value", "")
+            else:
+                # Dictionary format
+                var_name = variable.get("name", "")
+                var_value = variable.get("value", "")
+
+            env = env.replace("${" + var_name + "}", var_value)
         return env
 
     def _format_extra_hosts(self, extra_hosts):
diff --git a/gns3server/compute/project.py b/gns3server/compute/project.py
index 175d9e916..641c97e2c 100644
--- a/gns3server/compute/project.py
+++ b/gns3server/compute/project.py
@@ -293,9 +293,14 @@ class Project:
 
         # we need to update docker nodes when variables changes
         if original_variables != variables:
+            # Parallelize node updates for better performance
+            tasks = []
             for node in self.nodes:
                 if hasattr(node, "update"):
-                    await node.update()
+                    tasks.append(node.update())
+
+            if tasks:
+                await asyncio.gather(*tasks, return_exceptions=True)
 
     async def close(self):
         """
diff --git a/gns3server/controller/link.py b/gns3server/controller/link.py
index 76011b9f2..556f5ba5f 100644
--- a/gns3server/controller/link.py
+++ b/gns3server/controller/link.py
@@ -23,7 +23,7 @@ import html
 from .controller_error import ControllerError, ControllerNotFoundError
 from gns3server.agent.web_wireshark.manager import WebWiresharkManager
 from gns3server.config import Config
-from gns3server.utils.packet_filter_validation import validate_all_filters, FilterValidationError
+from gns3server.utils.packet_filter_validation import validate_all_filters, filter_inactive_filters, FilterValidationError
 
 import logging
 
@@ -148,19 +148,11 @@ class Link:
         """
         Modify the filters list.
 
-        Filter with value 0 will be dropped because not active
+        Filters with value 0 will be filtered out as inactive, with special
+        handling for delay filter to distinguish between "disabled" and "invalid config".
         """
-        new_filters = {}
-        for (filter, values) in filters.items():
-            new_values = []
-            for value in values:
-                if isinstance(value, str):
-                    new_values.append(value.strip("\n "))
-                else:
-                    new_values.append(int(value))
-            values = new_values
-            if len(values) != 0 and values[0] != 0 and values[0] != "":
-                new_filters[filter] = values
+        # Filter out inactive filters using the utility function
+        new_filters = filter_inactive_filters(filters)
 
         # Validate filter parameters before applying
         try:
diff --git a/gns3server/controller/project.py b/gns3server/controller/project.py
index ae063e4aa..4924f59e1 100644
--- a/gns3server/controller/project.py
+++ b/gns3server/controller/project.py
@@ -95,7 +95,7 @@ class Project:
         show_grid=False,
         grid_size=75,
         drawing_grid_size=25,
-        show_interface_labels=False,
+        show_interface_labels=True,
         variables=None,
         supplier=None,
         created_by=None,
@@ -1194,11 +1194,21 @@ class Project:
                     f"Please check the connection and try again."
                 )
 
+            # Parallel node creation for improved performance
+            # especially for projects with multiple Docker containers
+            nodes_to_create = []
             for node in topology.get("nodes", []):
                 compute = self.controller.get_compute(node.pop("compute_id"))
                 name = node.pop("name")
                 node_id = node.pop("node_id", str(uuid.uuid4()))
-                await self.add_node(compute, name, node_id, dump=False, **node)
+                nodes_to_create.append((compute, name, node_id, node))
+
+            # Create nodes in parallel with limited concurrency
+            # to avoid overwhelming the system with too many simultaneous operations
+            pool = Pool(concurrency=5)
+            for compute, name, node_id, node_data in nodes_to_create:
+                pool.append(self.add_node, compute, name, node_id, dump=False, **node_data)
+            await pool.join()
             for link_data in topology.get("links", []):
                 if "link_id" not in link_data.keys():
                     # skip the link
diff --git a/gns3server/utils/packet_filter_validation.py b/gns3server/utils/packet_filter_validation.py
index 0bd36fc5e..2ba67f6f5 100644
--- a/gns3server/utils/packet_filter_validation.py
+++ b/gns3server/utils/packet_filter_validation.py
@@ -170,6 +170,69 @@ def validate_filter_parameters(filter_type: str, values: List[Any]) -> None:
                 )
 
 
+def filter_inactive_filters(filters: Dict[str, List[Any]]) -> Dict[str, List[Any]]:
+    """
+    Filter out inactive packet filters before validation.
+
+    This function implements smart filtering logic:
+    - For most filters: value 0 means "disabled" and will be filtered out
+    - For delay filter: check both latency and jitter to determine intent
+      * delay: [0, 0] → User wants to disable delay completely, filter it out
+      * delay: [0, X] where X > 0 → Invalid config (latency must be >= 1), keep for validation error
+      * delay: [X, X] where X > 0 → Normal configuration, keep for validation
+
+    Args:
+        filters: Dictionary mapping filter types to their values
+
+    Returns:
+        Filtered dictionary with only active filters for validation
+    """
+
+    if not filters:
+        return {}
+
+    active_filters = {}
+    for filter_type, values in filters.items():
+        if not values or (isinstance(values, list) and len(values) == 0):
+            continue
+
+        # Normalize values (strip strings, convert to int)
+        normalized_values = []
+        for value in values:
+            if isinstance(value, str):
+                normalized_values.append(value.strip("\n "))
+            else:
+                normalized_values.append(int(value))
+        values = normalized_values
+
+        # Skip empty filters after normalization
+        if len(values) == 0:
+            continue
+
+        # Special handling for delay filter - check both latency and jitter
+        if filter_type == "delay":
+            if len(values) >= 1 and values[0] == 0:  # latency = 0
+                if len(values) >= 2 and values[1] == 0:  # jitter = 0 too
+                    # User intentionally disabling delay completely: [0, 0]
+                    log.debug(f"Filter {filter_type} with values {values} skipped (disabled)")
+                    continue  # Skip this filter silently
+                else:
+                    # Invalid config: latency=0 but jitter>0, keep for validation error
+                    log.debug(f"Filter {filter_type} with values {values} kept for validation (invalid config)")
+                    active_filters[filter_type] = values
+            else:
+                # latency>0, normal configuration
+                active_filters[filter_type] = values
+        # For other filters, skip if first value is 0 or empty string (means "disabled")
+        elif values[0] != 0 and values[0] != "":
+            active_filters[filter_type] = values
+        else:
+            # Filters like packet_loss=0, corrupt=0, frequency_drop=0 are intentionally disabled
+            log.debug(f"Filter {filter_type} with values {values} skipped (disabled)")
+
+    return active_filters
+
+
 def validate_all_filters(filters: Dict[str, List[Any]]) -> None:
     """
     Validate all packet filters.
diff --git a/scripts/update-bundled-web-ui.sh b/scripts/update-bundled-web-ui.sh
index ba4a9fe80..70742e253 100755
--- a/scripts/update-bundled-web-ui.sh
+++ b/scripts/update-bundled-web-ui.sh
@@ -104,11 +104,11 @@ if [ "$CUSTOM_REPO" = false ] ; then
             git checkout "$BRANCH"
             git pull
         else
-            git checkout master-3.0
+            git checkout 3.1
             git pull
         fi
     else
-        git checkout master-3.0
+        git checkout 3.1
         git fetch --tags
         git pull
     fi
diff --git a/tests/controller/test_project.py b/tests/controller/test_project.py
index 24d8aa033..24f9314ce 100644
--- a/tests/controller/test_project.py
+++ b/tests/controller/test_project.py
@@ -75,7 +75,7 @@ async def test_json():
         "scene_height": 1000,
         "zoom": 100,
         "show_grid": False,
-        "show_interface_labels": False,
+        "show_interface_labels": True,
         "show_layers": False,
         "snap_to_grid": False,
         "grid_size": 75,
diff --git a/tests/controller/test_topology.py b/tests/controller/test_topology.py
index 9e1f72f82..85492596c 100644
--- a/tests/controller/test_topology.py
+++ b/tests/controller/test_topology.py
@@ -45,7 +45,7 @@ async def test_project_to_topology_empty(tmpdir):
             "revision": GNS3_FILE_FORMAT_REVISION,
             "zoom": 100,
             "show_grid": False,
-            "show_interface_labels": False,
+            "show_interface_labels": True,
             "show_layers": False,
             "snap_to_grid": False,
             "grid_size": 75,
diff --git a/tests/utils/test_packet_filter_validation.py b/tests/utils/test_packet_filter_validation.py
index 3a9de41bd..d15ae1fc3 100644
--- a/tests/utils/test_packet_filter_validation.py
+++ b/tests/utils/test_packet_filter_validation.py
@@ -6,6 +6,7 @@ import pytest
 from gns3server.utils.packet_filter_validation import (
     validate_filter_parameters,
     validate_all_filters,
+    filter_inactive_filters,
     FilterValidationError
 )
 
@@ -160,4 +161,105 @@ class TestPacketFilterValidation:
     def test_unknown_filter_type(self):
         """Test unknown filter type."""
         with pytest.raises(FilterValidationError, match="Unknown filter type"):
-            validate_filter_parameters("unknown_filter", [1])
\ No newline at end of file
+            validate_filter_parameters("unknown_filter", [1])
+
+
+class TestFilterInactiveFilters:
+    """Test filter_inactive_filters function for smart filter filtering logic."""
+
+    def test_filter_inactive_delay_disabled(self):
+        """Test delay [0, 0] is filtered out (user wants to disable delay)."""
+        filters = {"delay": [0, 0]}
+        result = filter_inactive_filters(filters)
+        assert result == {}  # Should be filtered out
+
+    def test_filter_inactive_delay_invalid_config(self):
+        """Test delay [0, 100] is kept for validation (invalid config)."""
+        filters = {"delay": [0, 100]}
+        result = filter_inactive_filters(filters)
+        assert result == {"delay": [0, 100]}  # Should be kept for validation error
+
+    def test_filter_inactive_delay_normal_config(self):
+        """Test delay [100, 20] is kept (normal configuration)."""
+        filters = {"delay": [100, 20]}
+        result = filter_inactive_filters(filters)
+        assert result == {"delay": [100, 20]}  # Should be kept
+
+    def test_filter_inactive_delay_zero_jitter(self):
+        """Test delay [100, 0] is kept (normal config with zero jitter)."""
+        filters = {"delay": [100, 0]}
+        result = filter_inactive_filters(filters)
+        assert result == {"delay": [100, 0]}  # Should be kept
+
+    def test_filter_inactive_packet_loss_zero(self):
+        """Test packet_loss [0] is filtered out (disabled)."""
+        filters = {"packet_loss": [0]}
+        result = filter_inactive_filters(filters)
+        assert result == {}  # Should be filtered out
+
+    def test_filter_inactive_packet_loss_active(self):
+        """Test packet_loss [5] is kept (active)."""
+        filters = {"packet_loss": [5]}
+        result = filter_inactive_filters(filters)
+        assert result == {"packet_loss": [5]}  # Should be kept
+
+    def test_filter_inactive_corrupt_zero(self):
+        """Test corrupt [0] is filtered out (disabled)."""
+        filters = {"corrupt": [0]}
+        result = filter_inactive_filters(filters)
+        assert result == {}  # Should be filtered out
+
+    def test_filter_inactive_corrupt_active(self):
+        """Test corrupt [2] is kept (active)."""
+        filters = {"corrupt": [2]}
+        result = filter_inactive_filters(filters)
+        assert result == {"corrupt": [2]}  # Should be kept
+
+    def test_filter_inactive_frequency_drop_zero(self):
+        """Test frequency_drop [0] is filtered out (disabled)."""
+        filters = {"frequency_drop": [0]}
+        result = filter_inactive_filters(filters)
+        assert result == {}  # Should be filtered out
+
+    def test_filter_inactive_frequency_drop_active(self):
+        """Test frequency_drop [10] is kept (active)."""
+        filters = {"frequency_drop": [10]}
+        result = filter_inactive_filters(filters)
+        assert result == {"frequency_drop": [10]}  # Should be kept
+
+    def test_filter_inactive_bpf_empty(self):
+        """Test BPF empty string is filtered out."""
+        filters = {"bpf": [""]}
+        result = filter_inactive_filters(filters)
+        assert result == {}  # Should be filtered out
+
+    def test_filter_inactive_bpf_active(self):
+        """Test BPF with expression is kept."""
+        filters = {"bpf": ["tcp port 80"]}
+        result = filter_inactive_filters(filters)
+        assert result == {"bpf": ["tcp port 80"]}  # Should be kept
+
+    def test_filter_inactive_multiple_filters_mixed(self):
+        """Test multiple filters with mixed active/inactive states."""
+        filters = {
+            "delay": [0, 0],           # Disabled: [0, 0]
+            "packet_loss": [0],         # Disabled: 0%
+            "corrupt": [2],             # Active: 2%
+            "frequency_drop": [10]      # Active: every 10th packet
+        }
+        result = filter_inactive_filters(filters)
+        assert result == {
+            "corrupt": [2],
+            "frequency_drop": [10]
+        }
+
+    def test_filter_inactive_empty_filters(self):
+        """Test empty filters dictionary."""
+        filters = {}
+        result = filter_inactive_filters(filters)
+        assert result == {}
+
+    def test_filter_inactive_none_filters(self):
+        """Test None filters."""
+        result = filter_inactive_filters(None)
+        assert result == {}
\ No newline at end of file