diff --git a/Common/File/AndroidStorage.cpp b/Common/File/AndroidStorage.cpp
index 2325657c79..e192d8286f 100644
--- a/Common/File/AndroidStorage.cpp
+++ b/Common/File/AndroidStorage.cpp
@@ -34,7 +34,7 @@ void Android_StorageSetNativeActivity(jobject nativeActivity) {
 void Android_RegisterStorageCallbacks(JNIEnv * env, jobject obj) {
 	openContentUri = env->GetMethodID(env->GetObjectClass(obj), "openContentUri", "(Ljava/lang/String;Ljava/lang/String;)I");
 	_dbg_assert_(openContentUri);
-	listContentUriDir = env->GetMethodID(env->GetObjectClass(obj), "listContentUriDir", "(Ljava/lang/String;)[Ljava/lang/String;");
+	listContentUriDir = env->GetMethodID(env->GetObjectClass(obj), "listContentUriDir", "(Ljava/lang/String;Ljava/lang/String;)[Ljava/lang/String;");
 	_dbg_assert_(listContentUriDir);
 	contentUriCreateDirectory = env->GetMethodID(env->GetObjectClass(obj), "contentUriCreateDirectory", "(Ljava/lang/String;Ljava/lang/String;)I");
 	_dbg_assert_(contentUriCreateDirectory);
@@ -222,18 +222,19 @@ bool Android_FileExists(const std::string &fileUri) {
 	return exists;
 }
 
-std::vector<File::FileInfo> Android_ListContentUri(const std::string &path, bool *exists) {
+std::vector<File::FileInfo> Android_ListContentUri(const std::string &uri, const std::string &prefix, bool *exists) {
 	if (!g_nativeActivity) {
 		*exists = false;
-		return std::vector<File::FileInfo>();
+		return {};
 	}
 	auto env = getEnv();
 	*exists = true;
 
 	double start = time_now_d();
 
-	jstring param = env->NewStringUTF(path.c_str());
-	jobject retval = env->CallObjectMethod(g_nativeActivity, listContentUriDir, param);
+	jstring param = env->NewStringUTF(uri.c_str());
+	jstring filter = prefix.empty() ? nullptr : env->NewStringUTF(prefix.c_str());
+	jobject retval = env->CallObjectMethod(g_nativeActivity, listContentUriDir, param, filter);
 
 	jobjectArray fileList = (jobjectArray)retval;
 	std::vector<File::FileInfo> items;
@@ -245,11 +246,11 @@ std::vector<File::FileInfo> Android_ListContentUri(const std::string &path, bool
 			std::string line = charArray;
 			File::FileInfo info{};
 			if (line == "X") {
-				// Indicates an exception thrown, path doesn't exist.
+				// Indicates an exception thrown, uri doesn't exist.
 				*exists = false;
 			} else if (ParseFileInfo(line, &info)) {
 				// We can just reconstruct the URI.
-				info.fullName = Path(path) / info.name;
+				info.fullName = Path(uri) / info.name;
 				items.push_back(info);
 			}
 		}
@@ -261,7 +262,7 @@ std::vector<File::FileInfo> Android_ListContentUri(const std::string &path, bool
 	double elapsed = time_now_d() - start;
 	double threshold = 0.1;
 	if (elapsed >= threshold) {
-		INFO_LOG(Log::FileSystem, "Listing directory on content URI '%s' took %0.3f s (%d files, log threshold = %0.3f)", path.c_str(), elapsed, (int)items.size(), threshold);
+		INFO_LOG(Log::FileSystem, "Listing directory on content URI '%s' took %0.3f s (%d files, log threshold = %0.3f)", uri.c_str(), elapsed, (int)items.size(), threshold);
 	}
 	return items;
 }
diff --git a/Common/File/AndroidStorage.h b/Common/File/AndroidStorage.h
index 7e585c0161..62394ffc1d 100644
--- a/Common/File/AndroidStorage.h
+++ b/Common/File/AndroidStorage.h
@@ -35,6 +35,8 @@ extern std::string g_extFilesDir;
 extern std::string g_externalDir;
 extern std::string g_nativeLibDir;
 
+// Note that we don't use string_view much here because NewStringUTF doesn't have a size parameter.
+
 #if PPSSPP_PLATFORM(ANDROID) && !defined(__LIBRETRO__)
 
 #include <jni.h>
@@ -60,7 +62,7 @@ int64_t Android_GetFreeSpaceByFilePath(const std::string &filePath);
 bool Android_IsExternalStoragePreservedLegacy();
 const char *Android_ErrorToString(StorageError error);
 
-std::vector<File::FileInfo> Android_ListContentUri(const std::string &uri, bool *exists);
+std::vector<File::FileInfo> Android_ListContentUri(const std::string &uri, const std::string &prefix, bool *exists);
 
 void Android_RegisterStorageCallbacks(JNIEnv * env, jobject obj);
 
@@ -85,7 +87,7 @@ inline int64_t Android_GetFreeSpaceByContentUri(const std::string &uri) { return
 inline int64_t Android_GetFreeSpaceByFilePath(const std::string &filePath) { return -1; }
 inline bool Android_IsExternalStoragePreservedLegacy() { return false; }
 inline const char *Android_ErrorToString(StorageError error) { return ""; }
-inline std::vector<File::FileInfo> Android_ListContentUri(const std::string &uri, bool *exists) {
+inline std::vector<File::FileInfo> Android_ListContentUri(const std::string &uri, const std::string &prefix, bool *exists) {
 	*exists = false;
 	return std::vector<File::FileInfo>();
 }
diff --git a/Common/File/DirListing.cpp b/Common/File/DirListing.cpp
index 5b82f4a0cd..f17675fe2c 100644
--- a/Common/File/DirListing.cpp
+++ b/Common/File/DirListing.cpp
@@ -153,43 +153,47 @@ bool FileInfo::operator <(const FileInfo & other) const {
 		return false;
 }
 
-std::vector<File::FileInfo> ApplyFilter(std::vector<File::FileInfo> files, const char *filter) {
+std::vector<File::FileInfo> ApplyFilter(std::vector<File::FileInfo> files, const char *extensionFilter, std::string_view prefix) {
 	std::set<std::string> filters;
-	if (filter) {
+	if (extensionFilter) {
 		std::string tmp;
-		while (*filter) {
-			if (*filter == ':') {
+		while (*extensionFilter) {
+			if (*extensionFilter == ':') {
 				filters.emplace("." + tmp);
 				tmp.clear();
 			} else {
-				tmp.push_back(*filter);
+				tmp.push_back(*extensionFilter);
 			}
-			filter++;
+			extensionFilter++;
 		}
 		if (!tmp.empty())
 			filters.emplace("." + tmp);
 	}
 
 	auto pred = [&](const File::FileInfo &info) {
-		if (info.isDirectory || !filter)
+		if (info.isDirectory || !extensionFilter)
 			return false;
 		std::string ext = info.fullName.GetFileExtension();
+		if (!startsWith(info.name, prefix)) {
+			return false;
+		}
 		return filters.find(ext) == filters.end();
 	};
 	files.erase(std::remove_if(files.begin(), files.end(), pred), files.end());
 	return files;
 }
 
-bool GetFilesInDir(const Path &directory, std::vector<FileInfo> *files, const char *filter, int flags) {
+bool GetFilesInDir(const Path &directory, std::vector<FileInfo> *files, const char *filter, int flags, std::string_view prefix) {
 	if (SIMULATE_SLOW_IO) {
-		INFO_LOG(Log::System, "GetFilesInDir %s", directory.c_str());
+		INFO_LOG(Log::System, "GetFilesInDir %s (ext %s, prefix %.*s)", directory.c_str(), filter, (int)prefix.size(), prefix.data());
 		sleep_ms(300, "slow-io-sim");
 	}
 
 	if (directory.Type() == PathType::CONTENT_URI) {
 		bool exists = false;
-		std::vector<File::FileInfo> fileList = Android_ListContentUri(directory.ToString(), &exists);
-		*files = ApplyFilter(fileList, filter);
+		// TODO: Move prefix filtering over to the Java side for more speed.
+		std::vector<File::FileInfo> fileList = Android_ListContentUri(directory.ToString(), std::string(prefix), &exists);
+		*files = ApplyFilter(fileList, filter, "");
 		std::sort(files->begin(), files->end());
 		return exists;
 	}
@@ -213,6 +217,7 @@ bool GetFilesInDir(const Path &directory, std::vector<FileInfo> *files, const ch
 #if PPSSPP_PLATFORM(WINDOWS)
 	if (directory.IsRoot()) {
 		// Special path that means root of file system.
+		// This does not respect prefix filtering.
 		std::vector<std::string> drives = File::GetWindowsDrives();
 		for (auto drive = drives.begin(); drive != drives.end(); ++drive) {
 			if (*drive == "A:/" || *drive == "B:/")
@@ -248,9 +253,6 @@ bool GetFilesInDir(const Path &directory, std::vector<FileInfo> *files, const ch
 		return false;
 	}
 	do {
-		if (SIMULATE_SLOW_IO) {
-			sleep_ms(100, "slow-io-sim");
-		}
 		const std::string virtualName = ConvertWStringToUTF8(ffd.cFileName);
 		// check for "." and ".."
 		if (!(flags & GETFILES_GET_NAVIGATION_ENTRIES) && (virtualName == "." || virtualName == ".."))
@@ -261,6 +263,15 @@ bool GetFilesInDir(const Path &directory, std::vector<FileInfo> *files, const ch
 				continue;
 		}
 
+		if (!startsWith(virtualName, prefix)) {
+			continue;
+		}
+
+		if (SIMULATE_SLOW_IO) {
+			INFO_LOG(Log::System, "GetFilesInDir item %s", virtualName.c_str());
+			sleep_ms(50, "slow-io-sim");
+		}
+
 		FileInfo info;
 		info.name = virtualName;
 		info.fullName = directory / virtualName;
@@ -308,6 +319,10 @@ bool GetFilesInDir(const Path &directory, std::vector<FileInfo> *files, const ch
 				continue;
 		}
 
+		if (!startsWith(virtualName, prefix)) {
+			continue;
+		}
+
 		// Let's just reuse GetFileInfo. We're calling stat anyway to get isDirectory information.
 		Path fullName = directory / virtualName;
 
diff --git a/Common/File/DirListing.h b/Common/File/DirListing.h
index 4ad9ce0c3e..ccb274e58d 100644
--- a/Common/File/DirListing.h
+++ b/Common/File/DirListing.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <string>
+#include <string_view>
 #include <vector>
 #include <cstdio>
 #include <cstdint>
@@ -32,8 +33,8 @@ enum {
 	GETFILES_GET_NAVIGATION_ENTRIES = 2,  // If you don't set this, "." and ".." will be skipped.
 };
 
-bool GetFilesInDir(const Path &directory, std::vector<FileInfo> *files, const char *filter = nullptr, int flags = 0);
-std::vector<File::FileInfo> ApplyFilter(std::vector<File::FileInfo> files, const char *filter);
+bool GetFilesInDir(const Path &directory, std::vector<FileInfo> *files, const char *extensionFilter = nullptr, int flags = 0, std::string_view prefix = std::string_view());
+std::vector<File::FileInfo> ApplyFilter(std::vector<File::FileInfo> files, const char *extensionFilter, std::string_view prefix);
 
 #ifdef _WIN32
 std::vector<std::string> GetWindowsDrives();
diff --git a/Common/File/PathBrowser.cpp b/Common/File/PathBrowser.cpp
index 6d8177621e..399110d34b 100644
--- a/Common/File/PathBrowser.cpp
+++ b/Common/File/PathBrowser.cpp
@@ -230,7 +230,7 @@ std::string PathBrowser::GetFriendlyPath() const {
 	return path_.ToVisualString();
 }
 
-bool PathBrowser::GetListing(std::vector<File::FileInfo> &fileInfo, const char *filter, bool *cancel) {
+bool PathBrowser::GetListing(std::vector<File::FileInfo> &fileInfo, const char *extensionFilter, bool *cancel) {
 	std::unique_lock<std::mutex> guard(pendingLock_);
 	while (!IsListingReady() && (!cancel || !*cancel)) {
 		// In case cancel changes, just sleep. TODO: Replace with condition variable.
@@ -239,7 +239,7 @@ bool PathBrowser::GetListing(std::vector<File::FileInfo> &fileInfo, const char *
 		guard.lock();
 	}
 
-	fileInfo = ApplyFilter(pendingFiles_, filter);
+	fileInfo = ApplyFilter(pendingFiles_, extensionFilter, "");
 	return true;
 }
 
diff --git a/UI/GameInfoCache.cpp b/UI/GameInfoCache.cpp
index 93e2880788..93d2684b74 100644
--- a/UI/GameInfoCache.cpp
+++ b/UI/GameInfoCache.cpp
@@ -201,17 +201,18 @@ std::vector<Path> GameInfo::GetSaveDataDirectories() {
 	_dbg_assert_(hasFlags & GameInfoFlags::PARAM_SFO);  // so we know we have the ID.
 	Path memc = GetSysDirectory(DIRECTORY_SAVEDATA);
 
-	std::vector<File::FileInfo> dirs;
-	File::GetFilesInDir(memc, &dirs);
-
 	std::vector<Path> directories;
 	if (id.size() < 5) {
+		// Invalid game ID.
 		return directories;
 	}
+
+	std::vector<File::FileInfo> dirs;
+	const std::string &prefix = id;
+	File::GetFilesInDir(memc, &dirs, nullptr, 0, prefix);
+
 	for (size_t i = 0; i < dirs.size(); i++) {
-		if (startsWith(dirs[i].name, id)) {
-			directories.push_back(dirs[i].fullName);
-		}
+		directories.push_back(dirs[i].fullName);
 	}
 
 	return directories;
@@ -500,10 +501,6 @@ public:
 			info_->fileType = Identify_File(info_->GetFileLoader().get(), &errorString);
 		}
 
-		if (!info_->Ready(GameInfoFlags::FILE_TYPE) && !(flags_ & GameInfoFlags::FILE_TYPE)) {
-			_dbg_assert_(false);
-		}
-
 		switch (info_->fileType) {
 		case IdentifiedFileType::PSP_PBP:
 		case IdentifiedFileType::PSP_PBP_DIRECTORY:
diff --git a/UI/MainScreen.cpp b/UI/MainScreen.cpp
index 41598ab5bd..4c463b657a 100644
--- a/UI/MainScreen.cpp
+++ b/UI/MainScreen.cpp
@@ -978,6 +978,10 @@ std::vector<Path> GameBrowser::GetPinnedPaths() const {
 #else
 	static const std::string sepChars = "/\\";
 #endif
+	if (g_Config.vPinnedPaths.empty()) {
+		// Early-out.
+		return std::vector<Path>();
+	}
 
 	const std::string currentPath = File::ResolvePath(path_.GetPath().ToString());
 	const std::vector<std::string> paths = g_Config.vPinnedPaths;
diff --git a/android/src/org/ppsspp/ppsspp/PpssppActivity.java b/android/src/org/ppsspp/ppsspp/PpssppActivity.java
index e6a3ac3aa2..a2d1072f4d 100644
--- a/android/src/org/ppsspp/ppsspp/PpssppActivity.java
+++ b/android/src/org/ppsspp/ppsspp/PpssppActivity.java
@@ -9,6 +9,7 @@ import android.os.Bundle;
 import android.os.Environment;
 import android.os.Looper;
 import android.os.ParcelFileDescriptor;
+import android.provider.MediaStore;
 import android.util.Log;
 import android.system.StructStatVfs;
 import android.system.Os;
@@ -161,14 +162,14 @@ public class PpssppActivity extends NativeActivity {
 		// Filter out any virtual or partial nonsense.
 		// There's a bunch of potentially-interesting flags here btw,
 		// to figure out how to set access flags better, etc.
+		// Like FLAG_SUPPORTS_WRITE etc.
 		if ((flags & (DocumentsContract.Document.FLAG_PARTIAL | DocumentsContract.Document.FLAG_VIRTUAL_DOCUMENT)) != 0) {
 			return null;
 		}
-
 		final String mimeType = c.getString(3);
 		final boolean isDirectory = mimeType.equals(DocumentsContract.Document.MIME_TYPE_DIR);
 		final String documentName = c.getString(0);
-		final long size = c.getLong(1);
+		final long size = isDirectory ? 0 : c.getLong(1);
 		final long lastModified = c.getLong(4);
 
 		String str = "F|";
@@ -250,7 +251,7 @@ public class PpssppActivity extends NativeActivity {
 	// * https://stackoverflow.com/q
 	// uestions/42186820/documentfile-is-very-slow
 	@TargetApi(Build.VERSION_CODES.LOLLIPOP)
-	public String[] listContentUriDir(String uriString) {
+	public String[] listContentUriDir(String uriString, String prefix) {
 		Cursor c = null;
 		try {
 			Uri uri = Uri.parse(uriString);
@@ -258,7 +259,16 @@ public class PpssppActivity extends NativeActivity {
 			final Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(
 					uri, DocumentsContract.getDocumentId(uri));
 			final ArrayList<String> listing = new ArrayList<>();
-			c = resolver.query(childrenUri, columns, null, null, null);
+
+			String selection = null;
+			String[] selectionArgs = null;
+			if (prefix != null) {
+				selection = MediaStore.Files.FileColumns.DISPLAY_NAME + " LIKE ?";
+				// Prefix followed by wildcard
+				selectionArgs = new String[]{ prefix + "%" };
+			}
+
+			c = resolver.query(childrenUri, columns, selection, selectionArgs, null);
 			if (c == null) {
 				return new String[]{ "X" };
 			}