}
        String userId = MDC.get("userId");
        if (userId != null) {
            context.put("userId", userId);
        }
    }

    /**
     * Log an authentication event with optimized performance
     *
     * @param success whether authentication succeeded
     * @param username the username (will be masked if configured)
     * @param authMethod authentication method used (domain or method)

   * some other optimization, given that StringJoiner can over-allocate:
   * https://bugs.openjdk.org/browse/JDK-8305774
   */

  // TODO: b/381289911 - Optimize MapJoiner similarly to Joiner (including Android or not).

  /**
   * Returns a string containing the string representation of each of {@code parts}, using the
   * previously configured separator between each.
   *

#### Install Develocity IntelliJ plugin

Consider installing the [Develocity IntelliJ plugin](https://plugins.jetbrains.com/plugin/27471-develocity) to bring real-time Gradle build analysis directly into your IDE. 
It helps developers optimize performance and gain deeper insights into their builds.

## Making your change

### Code change guidelines

Code contributions should follow these guidelines to maximize the chance of them being accepted:

@GwtCompatible
public abstract class FluentFuture<V extends @Nullable Object>
    extends GwtFluentFutureCatchingSpecialization<V> {

  /**
   * A less abstract subclass of AbstractFuture. This can be used to optimize setFuture by ensuring
   * that {@link #get} calls exactly the implementation of {@link AbstractFuture#get}.
   */
  abstract static class TrustedFuture<V extends @Nullable Object> extends FluentFuture<V>

				if matched {
					return nil
				}
			}
		}
	}

	var (
		name     string
		idx      = strings.IndexByte(str, ',')
		settings = ParseTagSetting(str, ",")
	)

	// optimize match english letters and midline
	// The following code is basically called in for.
	// In order to avoid the performance problems caused by repeated compilation of regular expressions,

      next = (keyList == null) ? null : keyList.head;
    }

    /**
     * Constructs a new iterator over all values for the specified key starting at the specified
     * index. This constructor is optimized so that it starts at either the head or the tail,
     * depending on which is closer to the specified index. This allows adds to the tail to be done
     * in constant time.
     *

    }
    int[] stripes = new int[result.size()];
    for (int i = 0; i < result.size(); i++) {
      stripes[i] = indexFor(result.get(i));
    }
    Arrays.sort(stripes);
    // optimize for runs of identical stripes
    int previousStripe = stripes[0];
    result.set(0, getAt(previousStripe));
    for (int i = 1; i < result.size(); i++) {
      int currentStripe = stripes[i];

   *
   * <p>This class would certainly be simpler and easier to reason about if it were built with
   * ThreadLocal; however, ThreadLocal is not well optimized for the case where the ThreadLocal is
   * non-static, and is initialized/removed frequently - this causes churn in the Thread specific
   * hashmaps. Using a static ThreadLocal to avoid that overhead would mean that different

      return CollectSpliterators.indexed(
          size(), Spliterator.ORDERED | Spliterator.DISTINCT | Spliterator.NONNULL, this::getEntry);
    }

    // TODO(lowasser): consider an optimized values() implementation

    @Override
    public boolean containsKey(@Nullable Object key) {
      return keyIndex.containsKey(key);
    }

    @Override

	for i := 0; i < len(s); i++ {
		c := s[i]
		if c >= utf8.RuneSelf {
			isASCII = false
			break
		}
		hasLower = hasLower || ('a' <= c && c <= 'z')
	}

	if isASCII { // optimize for ASCII-only byte slices.
		if !hasLower {
			// Just return a copy.
			return append([]byte(""), s...)
		}
		b := bytealg.MakeNoZero(len(s))[:len(s):len(s)]
		for i := 0; i < len(s); i++ {
			c := s[i]