instancing 3d nodes off the main thread (in repl) is slow

[selfsame]

looks like this will get fixed with the vulcan renderer: godotengine/godot#36793

Alternately, we could consume REPL forms in the main thread.

[selfsame]

fixed with 5b46bc4

I'm happy with this hack,: using arcadia.core/timeout for tooling evals/loadfile to get into the main thread

[selfsame]

Re-opening this since the NRepl main-thead-eval wasn't working (see #20)

[kdlee]

To me seems like it's not just slow, but calling instance() from a thread also appears to have stability issues.
Using Godot 3.3, I'm getting crashes from places like below, even with RENDER_SEPARATE_THREAD mode set in the project.
Seems like calling instance() from a thread maybe isn't fully fleshed out yet ...

StringName::operator<(const StringName & p_name) Line 100 (godot\core\string_name.h:100)
Comparator::operator()(const StringName & p_a, const StringName & p_b) Line 292 (godot\core\typedefs.h:292)
Map<StringName,StringName,Comparator,DefaultAllocator>::_find(const StringName & p_key) Line 241 (godot\core\map.h:241)
Map<StringName,StringName,Comparator,DefaultAllocator>::find(const StringName & p_key) Line 533 (godot\core\map.h:533)
Shader::remap_param(const StringName & p_param) Line 92 (godot\scene\resources\shader.h:92)
ShaderMaterial::_get(const StringName & p_name, Variant & r_ret) Line 141 (godot\scene\resources\material.cpp:141)
ShaderMaterial::_getv(const StringName & p_name, Variant & r_ret) Line 78 (godot\scene\resources\material.h:78)
Object::get(const StringName & p_name, bool * r_valid) Line 516 (godot\core\object.cpp:516)
Resource::duplicate_for_local_scene(Node * p_for_scene, Map<Ref,Ref,Comparator<Ref>,DefaultAllocator> & remap_cache) Line 167 (godot\core\resource.cpp:167)
SceneState::instance(SceneState::GenEditState p_edit_state) Line 246 (godot\scene\resources\packed_scene.cpp:246)
PackedScene::instance(PackedScene::GenEditState p_edit_state) Line 1706 (godot\scene\resources\packed_scene.cpp:1706)

[selfsame]

@kdlee ah yeah that's unfortunate,

I've heard that instancing in threads will be better supported in Godot 4, but in the mean time if you use the UDP or Socket Repls they will eval on the main thread (https://github.com/arcadia-unity/ArcadiaGodot/blob/master/Source/arcadia/repl.clj#L256)