diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87ebe40fb4d..29aad168890 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -48,6 +48,13 @@ migration](https://github.com/open-telemetry/semantic-conventions/blob/main/docs
   The `code.namespace` attribute is no longer added. (#6870)
 - The `code.function` attribute emitted by `go.opentelemetry.io/contrib/bridges/otelzap` now stores the package path-qualified function name instead of just the function name.
   The `code.namespace` attribute is no longer added. (#6870)
+- Improve performance by reducing allocations for common request protocols in the modules below. (#6845)
+  - `go.opentelemetry.io/contrib/instrumentation/github.com/emicklei/go-restful/otelrestful`
+  - `go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin`
+  - `go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux`
+  - `go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho`
+  - `go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace`
+  - `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp`
 
 ### Deprecated
 
diff --git a/instrumentation/github.com/emicklei/go-restful/otelrestful/internal/semconv/util.go b/instrumentation/github.com/emicklei/go-restful/otelrestful/internal/semconv/util.go
index b28d5ea5405..4bd0e1bc2a3 100644
--- a/instrumentation/github.com/emicklei/go-restful/otelrestful/internal/semconv/util.go
+++ b/instrumentation/github.com/emicklei/go-restful/otelrestful/internal/semconv/util.go
@@ -78,7 +78,16 @@ func serverClientIP(xForwardedFor string) string {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
 
diff --git a/instrumentation/github.com/emicklei/go-restful/otelrestful/internal/semconvutil/netconv.go b/instrumentation/github.com/emicklei/go-restful/otelrestful/internal/semconvutil/netconv.go
index 75a51e0de41..9dccf349c57 100644
--- a/instrumentation/github.com/emicklei/go-restful/otelrestful/internal/semconvutil/netconv.go
+++ b/instrumentation/github.com/emicklei/go-restful/otelrestful/internal/semconvutil/netconv.go
@@ -200,6 +200,15 @@ func splitHostPort(hostport string) (host string, port int) {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
diff --git a/instrumentation/github.com/gin-gonic/gin/otelgin/internal/semconv/util.go b/instrumentation/github.com/gin-gonic/gin/otelgin/internal/semconv/util.go
index c97c1bc00fb..0ac571f7e21 100644
--- a/instrumentation/github.com/gin-gonic/gin/otelgin/internal/semconv/util.go
+++ b/instrumentation/github.com/gin-gonic/gin/otelgin/internal/semconv/util.go
@@ -78,7 +78,16 @@ func serverClientIP(xForwardedFor string) string {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
 
diff --git a/instrumentation/github.com/gin-gonic/gin/otelgin/internal/semconvutil/netconv.go b/instrumentation/github.com/gin-gonic/gin/otelgin/internal/semconvutil/netconv.go
index 7a1530a310d..f4ebbf28c8e 100644
--- a/instrumentation/github.com/gin-gonic/gin/otelgin/internal/semconvutil/netconv.go
+++ b/instrumentation/github.com/gin-gonic/gin/otelgin/internal/semconvutil/netconv.go
@@ -200,6 +200,15 @@ func splitHostPort(hostport string) (host string, port int) {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
diff --git a/instrumentation/github.com/gorilla/mux/otelmux/internal/semconv/util.go b/instrumentation/github.com/gorilla/mux/otelmux/internal/semconv/util.go
index 6a4e0a93b63..5b8b64d7db8 100644
--- a/instrumentation/github.com/gorilla/mux/otelmux/internal/semconv/util.go
+++ b/instrumentation/github.com/gorilla/mux/otelmux/internal/semconv/util.go
@@ -78,7 +78,16 @@ func serverClientIP(xForwardedFor string) string {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
 
diff --git a/instrumentation/github.com/gorilla/mux/otelmux/internal/semconvutil/netconv.go b/instrumentation/github.com/gorilla/mux/otelmux/internal/semconvutil/netconv.go
index 53602bacb46..020c4124537 100644
--- a/instrumentation/github.com/gorilla/mux/otelmux/internal/semconvutil/netconv.go
+++ b/instrumentation/github.com/gorilla/mux/otelmux/internal/semconvutil/netconv.go
@@ -200,6 +200,15 @@ func splitHostPort(hostport string) (host string, port int) {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
diff --git a/instrumentation/github.com/labstack/echo/otelecho/internal/semconvutil/netconv.go b/instrumentation/github.com/labstack/echo/otelecho/internal/semconvutil/netconv.go
index c4f54bdc8ec..06c8f80d5bc 100644
--- a/instrumentation/github.com/labstack/echo/otelecho/internal/semconvutil/netconv.go
+++ b/instrumentation/github.com/labstack/echo/otelecho/internal/semconvutil/netconv.go
@@ -200,6 +200,15 @@ func splitHostPort(hostport string) (host string, port int) {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
diff --git a/instrumentation/net/http/httptrace/otelhttptrace/internal/semconv/util.go b/instrumentation/net/http/httptrace/otelhttptrace/internal/semconv/util.go
index a34e0a0dc5d..78c3c374fc7 100644
--- a/instrumentation/net/http/httptrace/otelhttptrace/internal/semconv/util.go
+++ b/instrumentation/net/http/httptrace/otelhttptrace/internal/semconv/util.go
@@ -78,7 +78,16 @@ func serverClientIP(xForwardedFor string) string {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
 
diff --git a/instrumentation/net/http/httptrace/otelhttptrace/internal/semconvutil/netconv.go b/instrumentation/net/http/httptrace/otelhttptrace/internal/semconvutil/netconv.go
index 45d8cba6710..a5cdc3b3361 100644
--- a/instrumentation/net/http/httptrace/otelhttptrace/internal/semconvutil/netconv.go
+++ b/instrumentation/net/http/httptrace/otelhttptrace/internal/semconvutil/netconv.go
@@ -200,6 +200,15 @@ func splitHostPort(hostport string) (host string, port int) {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
diff --git a/instrumentation/net/http/otelhttp/internal/semconv/util.go b/instrumentation/net/http/otelhttp/internal/semconv/util.go
index 558efd0594b..315d3dd29cd 100644
--- a/instrumentation/net/http/otelhttp/internal/semconv/util.go
+++ b/instrumentation/net/http/otelhttp/internal/semconv/util.go
@@ -78,7 +78,16 @@ func serverClientIP(xForwardedFor string) string {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
 
diff --git a/instrumentation/net/http/otelhttp/internal/semconvutil/netconv.go b/instrumentation/net/http/otelhttp/internal/semconvutil/netconv.go
index b80a1db61fa..de74fa252a9 100644
--- a/instrumentation/net/http/otelhttp/internal/semconvutil/netconv.go
+++ b/instrumentation/net/http/otelhttp/internal/semconvutil/netconv.go
@@ -200,6 +200,15 @@ func splitHostPort(hostport string) (host string, port int) {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
diff --git a/internal/shared/semconv/util.go.tmpl b/internal/shared/semconv/util.go.tmpl
index 27b9fa60ccb..20daf9d30ca 100644
--- a/internal/shared/semconv/util.go.tmpl
+++ b/internal/shared/semconv/util.go.tmpl
@@ -78,7 +78,16 @@ func serverClientIP(xForwardedFor string) string {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }
 
diff --git a/internal/shared/semconvutil/netconv.go.tmpl b/internal/shared/semconvutil/netconv.go.tmpl
index 45a96c34f78..e7a9bd81f33 100644
--- a/internal/shared/semconvutil/netconv.go.tmpl
+++ b/internal/shared/semconvutil/netconv.go.tmpl
@@ -200,6 +200,15 @@ func splitHostPort(hostport string) (host string, port int) {
 
 func netProtocol(proto string) (name string, version string) {
 	name, version, _ = strings.Cut(proto, "/")
-	name = strings.ToLower(name)
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
 	return name, version
 }