make debug mode run similar speed (opt-level=1 + no validation layers)

Cargo.toml

@@ -26,3 +26,6 @@ path = "src/bin/client/main.rs"
 [[bin]]
 name = "openworm-server"
 path = "src/bin/server/main.rs"
+
+[profile.dev.package."*"]
+opt-level = 1

src/bin/client/render/mod.rs

@@ -72,6 +72,7 @@ impl Renderer {
 
         let instance = Instance::new(&InstanceDescriptor {
             backends: Backends::PRIMARY,
+            flags: InstanceFlags::empty(),
             ..Default::default()
         });