General improvements:

Added sharded cache to reduce lock contention
Optimized buffer usage with pre-sized pools
Improved HTTP client with connection pooling and timeouts
Reduced allocations in JSON handling

pools.go

@@ -0,0 +1,24 @@
+package gql
+
+import (
+	"bytes"
+	"sync"
+)
+
+var (
+	// Pre-sized buffer pool for better performance
+	bufferPool = sync.Pool{
+		New: func() interface{} {
+			// Pre-allocate buffer with 4KB capacity
+			b := bytes.NewBuffer(make([]byte, 0, 4096))
+			return b
+		},
+	}
+
+	// Pre-allocate error maps to reduce allocations
+	errPairsPool = sync.Pool{
+		New: func() interface{} {
+			return make(map[string]interface{}, 1)
+		},
+	}
+)