diff --git a/build.zig b/build.zig
index 3e7f285214..4f97e019f8 100644
--- a/build.zig
+++ b/build.zig
@@ -570,6 +570,7 @@ pub fn build(b: *std.Build) !void {
         if (is_windows) "-DWIN32_LEAN_AND_MEAN" else "",
         if (is_windows) "-DUTF8PROC_STATIC" else "",
         if (use_unibilium) "-DHAVE_UNIBILIUM" else "",
+        if (is_wasm) "-flto" else "",
     };
     nvim_mod.addCSourceFiles(.{ .files = src_paths, .flags = &flags });
 
@@ -610,14 +611,28 @@ pub fn build(b: *std.Build) !void {
         emcc.addArgs(&.{
             b.fmt("--sysroot={s}", .{s}),
             "-sALLOW_MEMORY_GROWTH=1",
-            "-sEXPORT_ALL=1",
-            "-sINITIAL_MEMORY=67108864",
+            "--profiling-funcs",
+            "-sEXPORTED_FUNCTIONS=_main,_malloc,_free",
+            "-sEXPORTED_RUNTIME_METHODS=stringToUTF8,lengthBytesUTF8,setValue,getValue,UTF8ToString,callMain,ENV,FS",
+            "-sSTACK_SIZE=134217728", // 64MB — emscripten's own flag, overrides its 65536
+            "-sINITIAL_MEMORY=536870912", // 256MB — stack(64MB) + data(12MB) + heap room
+            "-sMAXIMUM_MEMORY=2147483648",
             "-sFORCE_FILESYSTEM=1",
+            "-sNODERAWFS=0",
             "-sERROR_ON_UNDEFINED_SYMBOLS=0",
+            "-sEXIT_RUNTIME=0",
+            "-sINVOKE_RUN=0",
+            "-sGLOBAL_BASE=134217728",
+            "-sMODULARIZE=1",
+            "-sEXPORT_NAME=createNvim",
+            "-Wl,--unresolved-symbols=ignore-all",
             "--no-entry",
-            "-Wl,--export-all",
-            "-Wl,--no-gc-sections",
+            "-fexceptions",
+            "-flto",
+            "-sSTACK_OVERFLOW_CHECK=2",
+            "-sASSERTIONS=1",
         });
+
         emcc.addArg("-o");
         const nvim_js = emcc.addOutputFileArg("nvim.js");
         nvim_exe_step.dependOn(&b.addInstallFileWithDir(nvim_js, .bin, "nvim.js").step);