diff --git a/benchmarks/benches/data.rs b/benchmarks/benches/data.rs
index 4b9829dbe..090c8a556 100644
--- a/benchmarks/benches/data.rs
+++ b/benchmarks/benches/data.rs
@@ -21,7 +21,7 @@ const MUNICH_COORDS: TileCoords = TileCoords {
 pub struct DummyContext;
 
 impl Context for DummyContext {
-    fn send<T: IntoMessage>(&self, _message: T) -> Result<(), SendError> {
+    fn send_back<T: IntoMessage>(&self, _message: T) -> Result<(), SendError> {
         Ok(())
     }
 }
diff --git a/maplibre/src/headless/map.rs b/maplibre/src/headless/map.rs
index 3a3eadd83..b40e207dc 100644
--- a/maplibre/src/headless/map.rs
+++ b/maplibre/src/headless/map.rs
@@ -162,7 +162,7 @@ pub struct HeadlessContext {
 }
 
 impl Context for HeadlessContext {
-    fn send<T: IntoMessage>(&self, message: T) -> Result<(), SendError> {
+    fn send_back<T: IntoMessage>(&self, message: T) -> Result<(), SendError> {
         self.messages.deref().borrow_mut().push(message.into());
         Ok(())
     }
diff --git a/maplibre/src/io/apc.rs b/maplibre/src/io/apc.rs
index 165591ef1..d6792e632 100644
--- a/maplibre/src/io/apc.rs
+++ b/maplibre/src/io/apc.rs
@@ -88,7 +88,7 @@ pub enum SendError {
 /// Allows sending messages from workers to back to the caller.
 pub trait Context: 'static {
     /// Send a message back to the caller.
-    fn send<T: IntoMessage>(&self, message: T) -> Result<(), SendError>;
+    fn send_back<T: IntoMessage>(&self, message: T) -> Result<(), SendError>;
 }
 
 #[derive(Error, Debug)]
@@ -190,7 +190,7 @@ pub struct SchedulerContext {
 }
 
 impl Context for SchedulerContext {
-    fn send<T: IntoMessage>(&self, message: T) -> Result<(), SendError> {
+    fn send_back<T: IntoMessage>(&self, message: T) -> Result<(), SendError> {
         self.sender
             .send(message.into())
             .map_err(|_e| SendError::Transmission)
@@ -282,7 +282,7 @@ pub mod tests {
     pub struct DummyContext;
 
     impl Context for DummyContext {
-        fn send<T: IntoMessage>(&self, _message: T) -> Result<(), SendError> {
+        fn send_back<T: IntoMessage>(&self, _message: T) -> Result<(), SendError> {
             Ok(())
         }
     }
diff --git a/maplibre/src/raster/process_raster.rs b/maplibre/src/raster/process_raster.rs
index 77547f5bf..44ff038f4 100644
--- a/maplibre/src/raster/process_raster.rs
+++ b/maplibre/src/raster/process_raster.rs
@@ -55,7 +55,7 @@ impl<T: RasterTransferables, C: Context> ProcessRasterContext<T, C> {
         image_data: RgbaImage,
     ) -> Result<(), ProcessRasterError> {
         self.context
-            .send(T::LayerRaster::build_from(*coords, layer_name, image_data))
+            .send_back(T::LayerRaster::build_from(*coords, layer_name, image_data))
             .map_err(|e| ProcessRasterError::Processing(Box::new(e)))
     }
 }
diff --git a/maplibre/src/raster/request_system.rs b/maplibre/src/raster/request_system.rs
index cf2a24a40..410d73b1f 100644
--- a/maplibre/src/raster/request_system.rs
+++ b/maplibre/src/raster/request_system.rs
@@ -142,7 +142,7 @@ pub fn fetch_raster_apc<K: OffscreenKernel, T: RasterTransferables, C: Context +
                     log::error!("{e:?}");
 
                     context
-                        .send(<T as RasterTransferables>::LayerRasterMissing::build_from(
+                        .send_back(<T as RasterTransferables>::LayerRasterMissing::build_from(
                             coords,
                         ))
                         .map_err(ProcedureError::Send)?;
diff --git a/maplibre/src/vector/process_vector.rs b/maplibre/src/vector/process_vector.rs
index 991efb8d9..79ff7a3bc 100644
--- a/maplibre/src/vector/process_vector.rs
+++ b/maplibre/src/vector/process_vector.rs
@@ -125,7 +125,7 @@ impl<T: VectorTransferables, C: Context> ProcessVectorContext<T, C> {
 
     fn tile_finished(&mut self, coords: &WorldTileCoords) -> Result<(), ProcessVectorError> {
         self.context
-            .send(T::TileTessellated::build_from(*coords))
+            .send_back(T::TileTessellated::build_from(*coords))
             .map_err(|e| ProcessVectorError::SendError(e))
     }
 
@@ -135,7 +135,7 @@ impl<T: VectorTransferables, C: Context> ProcessVectorContext<T, C> {
         layer_name: &str,
     ) -> Result<(), ProcessVectorError> {
         self.context
-            .send(T::LayerMissing::build_from(*coords, layer_name.to_owned()))
+            .send_back(T::LayerMissing::build_from(*coords, layer_name.to_owned()))
             .map_err(|e| ProcessVectorError::SendError(e))
     }
 
@@ -147,7 +147,7 @@ impl<T: VectorTransferables, C: Context> ProcessVectorContext<T, C> {
         layer_data: tile::Layer,
     ) -> Result<(), ProcessVectorError> {
         self.context
-            .send(T::LayerTessellated::build_from(
+            .send_back(T::LayerTessellated::build_from(
                 *coords,
                 buffer,
                 feature_indices,
@@ -162,7 +162,7 @@ impl<T: VectorTransferables, C: Context> ProcessVectorContext<T, C> {
         geometries: Vec<IndexedGeometry<f64>>,
     ) -> Result<(), ProcessVectorError> {
         self.context
-            .send(T::LayerIndexed::build_from(
+            .send_back(T::LayerIndexed::build_from(
                 *coords,
                 TileIndex::Linear { list: geometries },
             ))
diff --git a/maplibre/src/vector/request_system.rs b/maplibre/src/vector/request_system.rs
index c2207a442..1c410fead 100644
--- a/maplibre/src/vector/request_system.rs
+++ b/maplibre/src/vector/request_system.rs
@@ -151,7 +151,7 @@ pub fn fetch_vector_apc<K: OffscreenKernel, T: VectorTransferables, C: Context +
                     log::error!("{e:?}");
                     for to_load in &fill_layers {
                         context
-                            .send(<T as VectorTransferables>::LayerMissing::build_from(
+                            .send_back(<T as VectorTransferables>::LayerMissing::build_from(
                                 coords,
                                 to_load.to_string(),
                             ))
diff --git a/web/lib/build.mjs b/web/lib/build.mjs
index d47a560d0..7c2b66b54 100644
--- a/web/lib/build.mjs
+++ b/web/lib/build.mjs
@@ -59,6 +59,7 @@ if (multithreaded) {
 let baseConfig = {
     platform: "browser",
     bundle: true,
+    minify: release,
     assetNames: "assets/[name]",
     define: {
         WEBGL: `${webgl}`,
diff --git a/web/lib/src/index.ts b/web/lib/src/index.ts
index 64e40f577..b49a82cb6 100644
--- a/web/lib/src/index.ts
+++ b/web/lib/src/index.ts
@@ -25,7 +25,7 @@ export const startMapLibre = async (wasmPath: string | undefined, workerPath: st
     preventDefaultTouchActions();
 
     if (MULTITHREADED) {
-        const MEMORY = 209715200; // 200MB
+        const MEMORY = 900 * 1024 * 1024; // 900 MB
         const PAGES = 64 * 1024;
 
         const memory = new WebAssembly.Memory({initial: 1024, maximum: MEMORY / PAGES, shared: true})
diff --git a/web/lib/src/multithreaded/multithreaded-pool.worker.ts b/web/lib/src/multithreaded/multithreaded-pool.worker.ts
index 75ff69a08..695f76bd1 100644
--- a/web/lib/src/multithreaded/multithreaded-pool.worker.ts
+++ b/web/lib/src/multithreaded/multithreaded-pool.worker.ts
@@ -1,7 +1,7 @@
 import * as maplibre from "../wasm/maplibre"
 
 type MessageData = {type: 'wasm_init', module: WebAssembly.Module, memory: WebAssembly.Memory}
-    | {type: 'call', work_ptr: number}
+    | {type: 'pool_call', work_ptr: number}
 
 let initialised: Promise<maplibre.InitOutput> = null
 
@@ -17,7 +17,7 @@ onmessage = async (message: MessageEvent<MessageData>) => {
         const data = message.data;
         const module = data.module;
         const memory = data.memory;
-        const initialised = maplibre.default(module, memory).catch(err => {
+        initialised = maplibre.default(module, memory).catch(err => {
             // Propagate to main `onerror`:
             setTimeout(() => {
                 throw err;
@@ -25,10 +25,8 @@ onmessage = async (message: MessageEvent<MessageData>) => {
             // Rethrow to keep promise rejected and prevent execution of further commands:
             throw err;
         });
-    } else if (type === 'call') {
+    } else if (type === 'pool_call') {
         const work_ptr = message.data.work_ptr; // because memory is shared, this pointer is valid in the memory of the main thread and this worker thread
-        // This will queue further commands up until the module is fully initialised:
-        await initialised;
 
         const process_data: (msg: any) => Promise<void> = maplibre["multithreaded_process_data"]
 
diff --git a/web/src/platform/multithreaded/pool.rs b/web/src/platform/multithreaded/pool.rs
index cff02abad..0b15ae87b 100644
--- a/web/src/platform/multithreaded/pool.rs
+++ b/web/src/platform/multithreaded/pool.rs
@@ -4,7 +4,6 @@
 
 use std::{cell::RefCell, rc::Rc};
 
-use js_sys::Promise;
 use rand::prelude::*;
 use wasm_bindgen::prelude::*;
 use web_sys::Worker;
@@ -17,8 +16,10 @@ extern "C" {
     fn new_worker() -> JsValue;
 }
 
+pub type PinnedFuture = std::pin::Pin<Box<(dyn std::future::Future<Output = ()> + 'static)>>;
+
 type NewWorker = Box<dyn Fn() -> Result<Worker, WebError>>;
-type Execute = Box<dyn (FnOnce() -> Promise) + Send>;
+type Execute = Box<dyn (FnOnce() -> PinnedFuture) + Send>;
 
 pub struct WorkerPool {
     new_worker: NewWorker,
@@ -44,7 +45,7 @@ pub struct Work {
 }
 
 impl Work {
-    pub fn execute(self) -> Promise {
+    pub fn execute(self) -> PinnedFuture {
         (self.func)()
     }
 }
@@ -139,13 +140,16 @@ impl WorkerPool {
     ///
     /// Returns any error that may happen while a JS web worker is created and a
     /// message is sent to it.
-    pub fn execute(&self, f: impl (FnOnce() -> Promise) + Send + 'static) -> Result<(), WebError> {
+    pub fn execute(
+        &self,
+        f: impl (FnOnce() -> PinnedFuture) + Send + 'static,
+    ) -> Result<(), WebError> {
         let worker = self.worker()?;
         let work = Work { func: Box::new(f) };
         let work_ptr = Box::into_raw(Box::new(work));
         match worker.post_message(
             &js_sys::Object::from_entries(&js_sys::Array::of2(
-                &js_sys::Array::of2(&JsValue::from("type"), &js_sys::JsString::from("call")),
+                &js_sys::Array::of2(&JsValue::from("type"), &js_sys::JsString::from("pool_call")),
                 &js_sys::Array::of2(&JsValue::from("work_ptr"), &JsValue::from(work_ptr as u32)),
             ))
             .expect("can not fail"),
diff --git a/web/src/platform/multithreaded/pool_scheduler.rs b/web/src/platform/multithreaded/pool_scheduler.rs
index 53488cbc9..3049a9968 100644
--- a/web/src/platform/multithreaded/pool_scheduler.rs
+++ b/web/src/platform/multithreaded/pool_scheduler.rs
@@ -36,12 +36,7 @@ impl Scheduler for WebWorkerPoolScheduler {
         T: Future<Output = ()> + 'static,
     {
         self.pool
-            .execute(move || {
-                wasm_bindgen_futures::future_to_promise(async move {
-                    future_factory().await;
-                    Ok(JsValue::undefined())
-                })
-            })
+            .execute(move || Box::pin(future_factory()))
             .map_err(|e| ScheduleError::Scheduling(Box::new(e)))
     }
 }
diff --git a/web/src/platform/multithreaded/wasm_entries.rs b/web/src/platform/multithreaded/wasm_entries.rs
index bf5fd59be..118ae3d07 100644
--- a/web/src/platform/multithreaded/wasm_entries.rs
+++ b/web/src/platform/multithreaded/wasm_entries.rs
@@ -1,15 +1,11 @@
-use maplibre::io::apc::CallError;
 use wasm_bindgen::prelude::*;
-use wasm_bindgen_futures::JsFuture;
 
 use crate::{platform::multithreaded::pool::Work, JSError};
 
 /// Entry point invoked by the worker.
 #[wasm_bindgen]
 pub async fn multithreaded_process_data(work_ptr: *mut Work) -> Result<(), JSError> {
-    let work = unsafe { Box::from_raw(work_ptr) };
-    JsFuture::from(work.execute())
-        .await
-        .map_err(|_e| CallError::Schedule)?;
+    let work: Box<Work> = unsafe { Box::from_raw(work_ptr) };
+    work.execute().await;
     Ok(())
 }
diff --git a/web/src/platform/singlethreaded/apc.rs b/web/src/platform/singlethreaded/apc.rs
index efa21f797..01e0b734e 100644
--- a/web/src/platform/singlethreaded/apc.rs
+++ b/web/src/platform/singlethreaded/apc.rs
@@ -84,7 +84,7 @@ pub struct PassingContext {
 }
 
 impl Context for PassingContext {
-    fn send<T: IntoMessage>(&self, message: T) -> Result<(), SendError> {
+    fn send_back<T: IntoMessage>(&self, message: T) -> Result<(), SendError> {
         let message = message.into();
         let tag = if WebMessageTag::LayerRaster.dyn_clone().as_ref() == message.tag() {
             &WebMessageTag::LayerRaster