- optimised main emulator loop, allowing updates only once every roughly 32,000 instructions.

- optimised memory access patterns, removing unecessary mutability and accesses.
- replaced the standard HashMap with an implementation that uses a faster hashing algorithm.

results:

before:
    - our benchmark program with ~4m instructions would take around for their data to make it to the UI, and a bit over 200ms to actually run

after:
    - our benchmark program with ~4m instructions can run in around 75ms, and the UI receives the update almost instantly.

conclusion:
- emulator performance should be around 2-3x faster than before.

Cargo.lock

@@ -783,9 +783,9 @@ dependencies = [
 
 [[package]]
 name = "discord-presence"
-version = "1.6.0"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f91d7c2fc01ffdc327e2b66d65dd59b8bd3f31a17e88811ce0540412fa0b84c1"
+checksum = "91948dab8ccaaefeb7be5f21714ed774411df66830def1f99dd74e7a85f5f111"
 dependencies = [
  "byteorder",
  "bytes",
@@ -1027,6 +1027,7 @@ dependencies = [
  "eframe",
  "egui",
  "egui_file",
+ "rustc-hash 2.1.1",
  "serde",
  "toml",
  "winit",