diff --git a/AGENTS.md b/AGENTS.md
index ec068fb8..c06ee9c6 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -5,28 +5,28 @@
 ### Basic Build
 ```bash
 # Configure with CMake (release build)
-cmake -B build
+cmake -B build -j16
 
 # Build the project
-cmake --build build
+cmake --build build -j16
 
 # Install (default system location)
-cmake --build build --target install
+cmake --build build --target install -j16
 
 # Local install (bin/lib/include in build directory)
-cmake -B build -DLOCAL=ON
+cmake -B build -DLOCAL=ON -j16
 ```
 
 ### With Tests
 ```bash
-cmake -B build -DTESTS=ON
-cmake --build build
+cmake -B build -DTESTS=ON -j16
+cmake --build build -j16
 cd build && ctest
 ```
 
 ### Build Only
 ```bash
-cmake --build build
+cmake --build build -j16
 ```
 
 ### Run Single Test
@@ -162,4 +162,4 @@ libs/
 - Project uses custom CMake macros from `cmake/` directory
 - Version format: `MAJOR.MINOR.REVISION` (e.g., 5.6.0)
 - All files have LGPL license header
-- Support for multiple platforms: Windows, Linux, QNX, Android, Apple
\ No newline at end of file
+- Support for multiple platforms: Windows, Linux, QNX, Android, Apple
diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc063fd0..35e6f0d0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,6 +69,8 @@ option(STD_IOSTREAM "Building with std iostream operators support" OFF)
 option(INTROSPECTION "Build with introspection" OFF)
 option(TESTS "Build tests and perform their before install step" OFF)
 option(COVERAGE "Build project with coverage info" OFF)
+option(PIP_NO_FILESYSTEM "Disable filesystem support" OFF)
+option(PIP_NO_THREADS "Disable threading support" OFF)
 option(PIP_FFTW_F "Support fftw module for float" ON)
 option(PIP_FFTW_L "Support fftw module for long double" ON)
 option(PIP_FFTW_Q "Support fftw module for quad double" OFF)
@@ -231,9 +233,17 @@ if(PIP_FREERTOS)
 endif()
 if(DEFINED PICO_BOARD)
 	add_definitions(-DPICO_SDK)
+	set(PIP_NO_FILESYSTEM ON CACHE BOOL "" FORCE)
 	message(STATUS "Building PIP for Pi Pico SDK ${PICO_SDK_VERSION_STRING}")
 endif()
 
+if(PIP_NO_FILESYSTEM)
+	add_definitions(-DPIP_NO_FILESYSTEM)
+endif()
+if(PIP_NO_THREADS)
+	add_definitions(-DPIP_NO_THREADS)
+endif()
+
 # Check Bessel functions
 set(CMAKE_REQUIRED_INCLUDES math.h)
 set(CMAKE_REQUIRED_LIBRARIES m)
diff --git a/libs/main/core/piinit.h b/libs/main/core/piinit.h
index d01eac26..3fa25ef7 100644
--- a/libs/main/core/piinit.h
+++ b/libs/main/core/piinit.h
@@ -35,6 +35,7 @@
 
 class PIFile;
 class PIStringList;
+class PIInit;
 
 
 class PIP_EXPORT __PIInit_Initializer__ {
diff --git a/libs/main/io_devices/pidir.cpp b/libs/main/io_devices/pidir.cpp
index bb0607b4..0239624a 100644
--- a/libs/main/io_devices/pidir.cpp
+++ b/libs/main/io_devices/pidir.cpp
@@ -16,6 +16,7 @@
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+#ifndef PIP_NO_FILESYSTEM
 #include "pidir.h"
 
 #include "piincludes_p.h"
@@ -610,3 +611,4 @@ void PIDir::CurrentDirOverrider::save(const PIFile::FileInfo & info) {
 	else
 		PIDir::setCurrent(PIDir::current().path() + PIDir::separator + p);
 }
+#endif // PIP_NO_FILESYSTEM
diff --git a/libs/main/io_devices/pidir.h b/libs/main/io_devices/pidir.h
index f97efdf8..c71a6199 100644
--- a/libs/main/io_devices/pidir.h
+++ b/libs/main/io_devices/pidir.h
@@ -30,6 +30,7 @@
 #include "piregularexpression.h"
 
 
+#ifndef PIP_NO_FILESYSTEM
 //! \ingroup IO
 //! \~\brief
 //! \~english Local directory.
@@ -217,8 +218,10 @@ private:
 
 	PIString path_, scan_;
 };
+#endif // PIP_NO_FILESYSTEM
 
 
+#ifndef PIP_NO_FILESYSTEM
 inline bool operator<(const PIFile::FileInfo & v0, const PIFile::FileInfo & v1) {
 	return (v0.path < v1.path);
 }
@@ -242,6 +245,7 @@ inline PICout operator<<(PICout s, const PIDir & v) {
 	s.restoreControls();
 	return s;
 }
+#endif // PIP_NO_FILESYSTEM
 
 
 #endif // PIDIR_H
diff --git a/libs/main/io_devices/pifile.cpp b/libs/main/io_devices/pifile.cpp
index 9bc1b073..2bd86ef3 100644
--- a/libs/main/io_devices/pifile.cpp
+++ b/libs/main/io_devices/pifile.cpp
@@ -17,6 +17,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#ifndef PIP_NO_FILESYSTEM
 #include "pifile.h"
 
 #include "pidir.h"
@@ -635,3 +636,4 @@ int PIFile::writeAll(const PIString & path, const PIByteArray & data) {
 	f.clear();
 	return f.write(data.data(), data.size_s());
 }
+#endif // PIP_NO_FILESYSTEM
diff --git a/libs/main/io_devices/pifile.h b/libs/main/io_devices/pifile.h
index f33ff682..44cb9859 100644
--- a/libs/main/io_devices/pifile.h
+++ b/libs/main/io_devices/pifile.h
@@ -30,6 +30,7 @@
 #include "pipropertystorage.h"
 
 
+#ifndef PIP_NO_FILESYSTEM
 //! \ingroup IO
 //! \~\brief
 //! \~english Local file.
@@ -345,8 +346,10 @@ private:
 	llong _size = -1;
 	PIString prec_str;
 };
+#endif // PIP_NO_FILESYSTEM
 
 
+#ifndef PIP_NO_FILESYSTEM
 //! \relatesalso PICout
 //! \~english Output operator to \a PICout
 //! \~russian Оператор вывода в \a PICout
@@ -377,5 +380,6 @@ BINARY_STREAM_READ(PIFile::FileInfo) {
 		v.perm_group.raw >> v.perm_other.raw;
 	return s;
 }
+#endif // PIP_NO_FILESYSTEM
 
 #endif // PIFILE_H
diff --git a/libs/main/piplatform.h b/libs/main/piplatform.h
index ec9ed6c8..e35ad80b 100644
--- a/libs/main/piplatform.h
+++ b/libs/main/piplatform.h
@@ -56,7 +56,7 @@
 #	define PIP_NO_THREADS
 #  endif
 #  ifndef LWIP
-#	define PIP_NO_SOCKET
+#    define PIP_NO_SOCKET
 #  endif
 #  define PISERIAL_NO_PINS
 #endif
diff --git a/libs/main/thread/piconditionvar.cpp b/libs/main/thread/piconditionvar.cpp
index 0c6412c4..0df181e9 100644
--- a/libs/main/thread/piconditionvar.cpp
+++ b/libs/main/thread/piconditionvar.cpp
@@ -23,6 +23,7 @@
 #  define _WIN32_WINNT 0x0600
 #endif
 
+#ifndef PIP_NO_THREADS
 #include "piconditionvar.h"
 #include "piincludes_p.h"
 #ifdef WINDOWS
@@ -179,3 +180,4 @@ void PIConditionVariable::notifyAll() {
 	pthread_cond_broadcast(&PRIVATE->nativeHandle);
 #endif
 }
+#endif // PIP_NO_THREADS
diff --git a/libs/main/thread/piconditionvar.h b/libs/main/thread/piconditionvar.h
index ee11ac78..d07a7ac3 100644
--- a/libs/main/thread/piconditionvar.h
+++ b/libs/main/thread/piconditionvar.h
@@ -30,6 +30,7 @@
 #include "pisystemtime.h"
 
 
+#ifndef PIP_NO_THREADS
 /**
  * \brief A condition variable is an object able to block the calling thread until notified to resume.
  *
@@ -121,5 +122,5 @@ private:
 	PRIVATE_DECLARATION(PIP_EXPORT)
 };
 
-
+#endif // PIP_NO_THREADS
 #endif // PICONDITIONVAR_H
diff --git a/libs/main/thread/pimutex.cpp b/libs/main/thread/pimutex.cpp
index a432e6a4..78a8dc15 100644
--- a/libs/main/thread/pimutex.cpp
+++ b/libs/main/thread/pimutex.cpp
@@ -107,6 +107,7 @@
 //! \}
 
 
+#ifndef PIP_NO_THREADS
 #include "pimutex.h"
 
 #include "piincludes_p.h"
@@ -228,3 +229,4 @@ void PIMutex::destroy() {
 	pthread_mutex_destroy(&(PRIVATE->mutex));
 #endif
 }
+#endif // PIP_NO_THREADS
diff --git a/libs/main/thread/pimutex.h b/libs/main/thread/pimutex.h
index c8315fdf..b4b6e40c 100644
--- a/libs/main/thread/pimutex.h
+++ b/libs/main/thread/pimutex.h
@@ -29,6 +29,7 @@
 #include "piinit.h"
 
 
+#ifndef PIP_NO_THREADS
 class PIP_EXPORT PIMutex {
 public:
 	NO_COPY_CLASS(PIMutex);
@@ -85,5 +86,5 @@ private:
 	bool cond;
 };
 
-
+#endif // PIP_NO_THREADS
 #endif // PIMUTEX_H
diff --git a/libs/main/thread/pithread.cpp b/libs/main/thread/pithread.cpp
index 4e03b73a..2d5e6bad 100644
--- a/libs/main/thread/pithread.cpp
+++ b/libs/main/thread/pithread.cpp
@@ -17,6 +17,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#ifndef PIP_NO_THREADS
 #include "pithread.h"
 
 #include "piincludes_p.h"
@@ -1086,3 +1087,4 @@ bool PIThread::_waitForFinish(PISystemTime max_tm) {
 #endif
 	return false;
 }
+#endif // PIP_NO_THREADS
diff --git a/libs/main/thread/pithread.h b/libs/main/thread/pithread.h
index af97009e..42d04c89 100644
--- a/libs/main/thread/pithread.h
+++ b/libs/main/thread/pithread.h
@@ -33,6 +33,7 @@
 
 class PIThread;
 
+#ifndef PIP_NO_THREADS
 #ifndef MICRO_PIP
 class PIIntrospectionThreads;
 
@@ -304,5 +305,5 @@ private:
 	void setThreadName();
 };
 
-
+#endif // PIP_NO_THREADS
 #endif // PITHREAD_H
diff --git a/libs/main/thread/pitimer.cpp b/libs/main/thread/pitimer.cpp
index 84a72e6f..a50ec43d 100644
--- a/libs/main/thread/pitimer.cpp
+++ b/libs/main/thread/pitimer.cpp
@@ -17,6 +17,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#ifndef PIP_NO_THREADS
 #include "pitimer.h"
 
 #include "piconditionvar.h"
@@ -302,3 +303,4 @@ void PITimer::stop() {
 	thread->stop();
 	event.notifyAll();
 }
+#endif // PIP_NO_THREADS
diff --git a/libs/main/thread/pitimer.h b/libs/main/thread/pitimer.h
index 1f40ac4c..e9f931cf 100644
--- a/libs/main/thread/pitimer.h
+++ b/libs/main/thread/pitimer.h
@@ -33,6 +33,7 @@
 
 class PIThread;
 
+#ifndef PIP_NO_THREADS
 class PIP_EXPORT PITimer: public PIObject {
 	PIOBJECT_SUBCLASS(PITimer, PIObject);
 
@@ -209,5 +210,5 @@ protected:
 	PIConditionVariable event;
 };
 
-
+#endif // PIP_NO_THREADS
 #endif // PITIMER_H
diff --git a/libs/main/types/pitime.cpp b/libs/main/types/pitime.cpp
index 66a181e9..68f608ae 100644
--- a/libs/main/types/pitime.cpp
+++ b/libs/main/types/pitime.cpp
@@ -26,6 +26,8 @@
 #  include "pisystemtests.h"
 #elif defined(ARDUINO)
 #  include <Arduino.h>
+#elif defined(PICO_SDK)
+#  include "hardware/time.h"
 #endif
 #ifdef MICRO_PIP
 #  include <sys/time.h>
@@ -48,28 +50,13 @@
 void piUSleep(int usecs) {
 	if (usecs <= 0) return;
 #ifdef WINDOWS
-	// printf("Sleep %d\n", usecs / 1000);
-	if (usecs > 0) Sleep(usecs / 1000);
-		// printf("Sleep end");
-#else
-#  ifdef FREERTOS
+	Sleep(usecs / 1000);
+#elif defined(FREERTOS)
 	vTaskDelay(usecs / 1000 / portTICK_PERIOD_MS);
-#  else
-#    ifdef MICRO_PIP
-	if (usecs > 0) {
-		struct timeval start;
-		gettimeofday(&start, nullptr);
-		long long elapsed = 0;
-		while (elapsed < usecs) {
-			struct timeval now;
-			gettimeofday(&now, nullptr);
-			elapsed = (now.tv_sec - start.tv_sec) * 1000000LL + (now.tv_usec - start.tv_usec);
-		}
-	}
-#    else
+#elif defined(PICO_SDK)
+	sleep_us(usecs);
+#else
 	usecs -= PISystemTests::usleep_offset_us;
 	if (usecs > 0) usleep(usecs);
-#    endif
-#  endif
 #endif
 }