perf: reduce memory usage and lazy-load proxy module

- Add Firefox prefs: disable WebGL, GPU accel, hardware video decoding,
  cap JS heap to 512MB, reduce HTTP connections
- Shrink window size 1280x720 -> 1024x600
- Lazy-load proxy module in app.py/_start_stream_proxy() and remove
  unused import from server.py

Author: maebahesioru

src/api/app.py

@@ -14,7 +14,6 @@
 from models import WebSocketConnectionManager
 from logger import initialize_logging, restore_streams
 from browser import _initialize_page_logic, _close_page_logic, load_excluded_models, _handle_initial_model_state_and_storage
-import proxy
 from asyncio import Queue, Lock
 from . import auth_utils
 playwright_manager: Optional[AsyncPlaywright] = None
@@ -82,6 +81,7 @@ async def _wait_for_port(port: int, timeout: float = 10.0, interval: float = 0.3
     return False
 
 async def _start_stream_proxy():
+    import proxy
     import server
     STREAM_PORT = os.environ.get('STREAM_PORT')
     if STREAM_PORT != '0':

src/launch_camoufox.py

@@ -499,8 +499,20 @@ def determine_proxy_configuration(internal_camoufox_proxy_arg=None):
                 'network.dns.disablePrefetch': True,
                 # Reduce font memory
                 'gfx.font_rendering.fontconfig.max_generic_substitutions': 3,
+                # Disable GPU / hardware acceleration
+                'layers.acceleration.disabled': True,
+                'gfx.direct2d.disabled': True,
+                'media.hardware-video-decoding.enabled': False,
+                # Disable WebGL (not needed for AI Studio)
+                'webgl.disabled': True,
+                'webgl.enable-webgl2': False,
+                # Cap JS heap
+                'javascript.options.mem.max': 512,
+                # Reduce HTTP connections
+                'network.http.max-connections': 6,
+                'network.http.max-persistent-connections-per-server': 2,
             }
-            launch_args_for_internal_camoufox = {'port': camoufox_port_internal, 'addons': [], 'exclude_addons': [DefaultAddons.UBO], 'window': (1280, 720), 'firefox_user_prefs': memory_optimization_prefs}
+            launch_args_for_internal_camoufox = {'port': camoufox_port_internal, 'addons': [], 'exclude_addons': [DefaultAddons.UBO], 'window': (1024, 600), 'firefox_user_prefs': memory_optimization_prefs}
             if camoufox_proxy_internal:
                 launch_args_for_internal_camoufox['proxy'] = {'server': camoufox_proxy_internal}
             if auth_file:

src/server.py

@@ -26,7 +26,6 @@
 import uuid
 import datetime
 import aiohttp
-import proxy
 import queue
 from config import *
 from models import FunctionCall, ToolCall, MessageContentItem, Message, ChatCompletionRequest, ClientDisconnectedError, StreamToLogger, WebSocketConnectionManager, WebSocketLogHandler