Use much higher buffer sizes

src/Server.zig

@@ -447,9 +447,11 @@ fn unsubscribe(
 /// Try to match the kernel socket buffers to maximize
 /// the amount of data we push through each syscall.
 fn getBufferSizes(io: Io) @Tuple(&.{ usize, usize }) {
-    const default_size = 8 * 1024 * 1024;
+    const default_size = 128 * 1024 * 1024;
     const default = .{ default_size, default_size };
 
+    if (true) return default;
+
     const dir = Dir.openDirAbsolute(io, "/proc/sys/net/core", .{}) catch {
         log.warn("couldn't open /proc/sys/net/core", .{});
         return default;