diff --git a/src/framework/core/filestream.cpp b/src/framework/core/filestream.cpp
index de92dc9a..d2f04e8b 100644
--- a/src/framework/core/filestream.cpp
+++ b/src/framework/core/filestream.cpp
@@ -28,6 +28,7 @@ FileStream::FileStream(const std::string& name, PHYSFS_File *fileHandle)
 {
     m_name = name;
     m_fileHandle = fileHandle;
+    m_cacheReadPos = 0;
 }
 
 FileStream::~FileStream()
@@ -35,6 +36,24 @@ FileStream::~FileStream()
     close();
 }
 
+void FileStream::cache()
+{
+    if(!m_fileHandle)
+        logTraceError("no file handle to cache");
+
+    // cache entire file into cache buffer
+    m_cacheReadPos = PHYSFS_tell(m_fileHandle);
+    PHYSFS_seek(m_fileHandle, 0);
+    int size = PHYSFS_fileLength(m_fileHandle);
+    m_cacheBuffer.resize(size);
+    int res = PHYSFS_read(m_fileHandle, &m_cacheBuffer[0], size, 1);
+    if(res == -1)
+        logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+
+    PHYSFS_close(m_fileHandle);
+    m_fileHandle = nullptr;
+}
+
 bool FileStream::close()
 {
     if(m_fileHandle) {
@@ -43,12 +62,18 @@ bool FileStream::close()
 
         m_fileHandle = nullptr;
         return true;
+    } else {
+        m_cacheBuffer.clear();
+        m_cacheReadPos = 0;
+        return true;
     }
-    return false;
 }
 
 bool FileStream::flush()
 {
+    if(!m_fileHandle)
+        return false;
+
     if(PHYSFS_flush(m_fileHandle) == 0) {
         logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
         return false;
@@ -58,71 +83,143 @@ bool FileStream::flush()
 
 int FileStream::read(void *buffer, int size, int nmemb)
 {
-    int res = PHYSFS_read(m_fileHandle, buffer, size, nmemb);
-    if(res == -1) {
-        logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
-        return 0;
+    if(m_fileHandle) {
+        int res = PHYSFS_read(m_fileHandle, buffer, size, nmemb);
+        if(res == -1) {
+            logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+            return 0;
+        }
+        return res;
+    } else {
+        uint maxReadPos = m_cacheBuffer.size()-1;
+        int writePos = 0;
+        uint8 *outBuffer = (uint8*)buffer;
+        for(int i=0;i<nmemb;++i) {
+            if(m_cacheReadPos+size > maxReadPos)
+                return i;
+
+            for(int j=0;j<size;++j)
+                outBuffer[writePos++] = m_cacheBuffer[m_cacheReadPos++];
+        }
+        return nmemb;
     }
-    return res;
 }
 
 bool FileStream::write(void *buffer, int count)
 {
+    if(!m_fileHandle)
+        return false;
+
     if(PHYSFS_write(m_fileHandle, buffer, 1, count) != count) {
         logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
         return false;
     }
+
     return true;
 }
 
 bool FileStream::seek(int pos)
 {
-    if(PHYSFS_seek(m_fileHandle, pos) == 0) {
-        logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
-        return false;
+    if(m_fileHandle) {
+        if(PHYSFS_seek(m_fileHandle, pos) == 0) {
+            logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+            return false;
+        }
+    } else {
+        if(pos > (int)m_cacheBuffer.size() || pos < 0) {
+            logTraceError("operation failed on '", m_name, "': seek pos cannot be greater than file length");
+            return false;
+        }
+        m_cacheReadPos = pos;
     }
     return true;
 }
 
 int FileStream::size()
 {
-    return PHYSFS_fileLength(m_fileHandle);
+    if(m_fileHandle) 
+        return PHYSFS_fileLength(m_fileHandle);
+    else
+        return m_cacheBuffer.size();
 }
 
 int FileStream::tell()
 {
-    return PHYSFS_tell(m_fileHandle);
+    if(m_fileHandle)
+        return PHYSFS_tell(m_fileHandle);
+    else
+        return m_cacheReadPos;
 }
 
 uint8 FileStream::getU8()
 {
     uint8 v = 0;
-    if(PHYSFS_read(m_fileHandle, &v, 1, 1) != 1)
-        logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+    if(m_fileHandle) {
+        if(PHYSFS_read(m_fileHandle, &v, 1, 1) != 1)
+            logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+    } else {
+        if(m_cacheReadPos+1 >= m_cacheBuffer.size()) {
+            logTraceError("operation failed on '", m_name, "': reached file eof");
+            return 0;
+        }
+
+        v = m_cacheBuffer[m_cacheReadPos];
+        m_cacheReadPos += 1;
+    }
     return v;
 }
 
 uint16 FileStream::getU16()
 {
     uint16 v = 0;
-    if(PHYSFS_readULE16(m_fileHandle, &v) == 0)
-        logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+    if(m_fileHandle) {
+        if(PHYSFS_readULE16(m_fileHandle, &v) == 0)
+            logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+    } else {
+        if(m_cacheReadPos+2 >= m_cacheBuffer.size()) {
+            logTraceError("operation failed on '", m_name, "': reached file eof");
+            return 0;
+        }
+
+        v = Fw::readLE16(&m_cacheBuffer[m_cacheReadPos]);
+        m_cacheReadPos += 2;
+    }
     return v;
 }
 
 uint32 FileStream::getU32()
 {
     uint32 v = 0;
-    if(PHYSFS_readULE32(m_fileHandle, &v) == 0)
-        logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+    if(m_fileHandle) {
+        if(PHYSFS_readULE32(m_fileHandle, &v) == 0)
+            logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+    } else {
+        if(m_cacheReadPos+4 >= m_cacheBuffer.size()) {
+            logTraceError("operation failed on '", m_name, "': reached file eof");
+            return 0;
+        }
+
+        v = Fw::readLE32(&m_cacheBuffer[m_cacheReadPos]);
+        m_cacheReadPos += 4;
+    }
     return v;
 }
 
 uint64 FileStream::getU64()
 {
     uint64 v = 0;
-    if(PHYSFS_readULE64(m_fileHandle, (PHYSFS_uint64*)&v) == 0)
-        logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+    if(m_fileHandle) {
+        if(PHYSFS_readULE64(m_fileHandle, (PHYSFS_uint64*)&v) == 0)
+            logTraceError("operation failed on '", m_name, "': ", PHYSFS_getLastError());
+    } else {
+        if(m_cacheReadPos+8 >= m_cacheBuffer.size()) {
+            logTraceError("operation failed on '", m_name, "': reached file eof");
+            return 0;
+        }
+
+        v = Fw::readLE64(&m_cacheBuffer[m_cacheReadPos]);
+        m_cacheReadPos += 8;
+    }
     return v;
 }
 
diff --git a/src/framework/core/filestream.h b/src/framework/core/filestream.h
index 93bb6b6e..2510f1c2 100644
--- a/src/framework/core/filestream.h
+++ b/src/framework/core/filestream.h
@@ -37,6 +37,7 @@ protected:
 public:
     ~FileStream();
 
+    void cache();
     bool close();
     bool flush();
     bool write(void *buffer, int count);
@@ -60,6 +61,9 @@ public:
 private:
     std::string m_name;
     PHYSFS_File *m_fileHandle;
+
+    std::vector<uint8_t> m_cacheBuffer;
+    uint m_cacheReadPos;
 };
 
 #endif
diff --git a/src/framework/graphics/coordsbuffer.cpp b/src/framework/graphics/coordsbuffer.cpp
index d802c0fa..17043a52 100644
--- a/src/framework/graphics/coordsbuffer.cpp
+++ b/src/framework/graphics/coordsbuffer.cpp
@@ -100,7 +100,13 @@ void CoordsBuffer::updateCaches()
     if(!m_hardwareCaching || m_hardwareCached)
         return;
 
-    if(m_vertexArray.vertexCount() > 0) {
+    int vertexCount = m_vertexArray.vertexCount();
+
+    // there is only performance improvement when caching a lot of vertices
+    if(vertexCount < CACHE_MIN_VERTICES_COUNT)
+        return;
+
+    if(vertexCount > 0) {
         if(!m_hardwareVertexArray && m_vertexArray.vertexCount() > 0)
             m_hardwareVertexArray = new HardwareBuffer(HardwareBuffer::VertexBuffer);
         m_hardwareVertexArray->bind();
diff --git a/src/framework/graphics/coordsbuffer.h b/src/framework/graphics/coordsbuffer.h
index c65ca780..72940ca1 100644
--- a/src/framework/graphics/coordsbuffer.h
+++ b/src/framework/graphics/coordsbuffer.h
@@ -28,6 +28,9 @@
 
 class CoordsBuffer
 {
+    enum {
+        CACHE_MIN_VERTICES_COUNT = 48
+    };
 public:
     CoordsBuffer();
     ~CoordsBuffer();
diff --git a/src/framework/graphics/painter.cpp b/src/framework/graphics/painter.cpp
index b6e84ad1..f68a7ee9 100644
--- a/src/framework/graphics/painter.cpp
+++ b/src/framework/graphics/painter.cpp
@@ -104,25 +104,27 @@ void Painter::setTexture(Texture* texture)
 
     m_texture = texture;
 
+    GLuint glTextureId;
     if(texture) {
         setTextureMatrix(texture->getTransformMatrix());
+        glTextureId = texture->getId();
+    } else
+        glTextureId = 0;
 
-        GLuint glTextureId = texture->getId();
-        if(glTextureId != m_glTextureId) {
-            m_glTextureId = glTextureId;
-            updateGlTexture();
-        }
+    if(m_glTextureId != glTextureId) {
+        m_glTextureId = glTextureId;
+        updateGlTexture();
     }
 }
 
 void Painter::updateGlTexture()
 {
-    glBindTexture(GL_TEXTURE_2D, m_glTextureId);
+    if(m_glTextureId != 0)
+        glBindTexture(GL_TEXTURE_2D, m_glTextureId);
 }
 
 void Painter::updateGlCompositionMode()
 {
-    glEnable(GL_BLEND);
     switch(m_compositionMode) {
         case CompositionMode_Normal:
             glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
diff --git a/src/framework/graphics/painterogl1.cpp b/src/framework/graphics/painterogl1.cpp
index cd766baf..ba58def6 100644
--- a/src/framework/graphics/painterogl1.cpp
+++ b/src/framework/graphics/painterogl1.cpp
@@ -62,7 +62,12 @@ void PainterOGL1::drawCoords(CoordsBuffer& coordsBuffer, DrawMode drawMode)
     if(vertexCount == 0)
         return;
 
-    bool textured = coordsBuffer.getTextureCoordCount() != 0;
+    bool textured = coordsBuffer.getTextureCoordCount() != 0 && m_texture;
+
+    // skip drawing of empty textures
+    if(textured && m_texture->isEmpty())
+        return;
+
     if(textured != m_textureEnabled) {
         if(textured)
             glEnable(GL_TEXTURE_2D);
@@ -121,7 +126,7 @@ void PainterOGL1::drawCoords(CoordsBuffer& coordsBuffer, DrawMode drawMode)
 
 void PainterOGL1::drawTextureCoords(CoordsBuffer& coordsBuffer, const TexturePtr& texture)
 {
-    if(!texture->getId())
+    if(texture->isEmpty())
         return;
 
     setTexture(texture.get());
@@ -130,7 +135,7 @@ void PainterOGL1::drawTextureCoords(CoordsBuffer& coordsBuffer, const TexturePtr
 
 void PainterOGL1::drawTexturedRect(const Rect& dest, const TexturePtr& texture, const Rect& src)
 {
-    if(dest.isEmpty() || src.isEmpty() || !texture->getId())
+    if(dest.isEmpty() || src.isEmpty() || texture->isEmpty())
         return;
 
     setTexture(texture.get());
@@ -142,7 +147,7 @@ void PainterOGL1::drawTexturedRect(const Rect& dest, const TexturePtr& texture,
 
 void PainterOGL1::drawRepeatedTexturedRect(const Rect& dest, const TexturePtr& texture, const Rect& src)
 {
-    if(dest.isEmpty() || src.isEmpty() || !texture->getId())
+    if(dest.isEmpty() || src.isEmpty() || texture->isEmpty())
         return;
 
     setTexture(texture.get());
diff --git a/src/framework/graphics/painterogl2.cpp b/src/framework/graphics/painterogl2.cpp
index 51b9cdcb..d9140de9 100644
--- a/src/framework/graphics/painterogl2.cpp
+++ b/src/framework/graphics/painterogl2.cpp
@@ -62,7 +62,11 @@ void PainterOGL2::drawCoords(CoordsBuffer& coordsBuffer, DrawMode drawMode)
     if(vertexCount == 0)
         return;
 
-    bool textured = coordsBuffer.getTextureCoordCount() > 0;
+    bool textured = coordsBuffer.getTextureCoordCount() > 0 && m_texture;
+
+    // skip drawing of empty textures
+    if(textured && m_texture->isEmpty())
+        return;
 
     // update shader with the current painter state
     m_drawProgram->bind();
@@ -100,7 +104,7 @@ void PainterOGL2::drawCoords(CoordsBuffer& coordsBuffer, DrawMode drawMode)
 
 void PainterOGL2::drawTextureCoords(CoordsBuffer& coordsBuffer, const TexturePtr& texture)
 {
-    if(!texture->getId())
+    if(texture->isEmpty())
         return;
 
     setDrawProgram(m_shaderProgram ? m_shaderProgram : g_shaders.getDrawTexturedProgram().get());
@@ -110,7 +114,7 @@ void PainterOGL2::drawTextureCoords(CoordsBuffer& coordsBuffer, const TexturePtr
 
 void PainterOGL2::drawTexturedRect(const Rect& dest, const TexturePtr& texture, const Rect& src)
 {
-    if(dest.isEmpty() || src.isEmpty() || !texture->getId())
+    if(dest.isEmpty() || src.isEmpty() || texture->isEmpty())
         return;
 
     setDrawProgram(m_shaderProgram ? m_shaderProgram : g_shaders.getDrawTexturedProgram().get());
@@ -123,7 +127,7 @@ void PainterOGL2::drawTexturedRect(const Rect& dest, const TexturePtr& texture,
 
 void PainterOGL2::drawRepeatedTexturedRect(const Rect& dest, const TexturePtr& texture, const Rect& src)
 {
-    if(dest.isEmpty() || src.isEmpty() || !texture->getId())
+    if(dest.isEmpty() || src.isEmpty() || texture->isEmpty())
         return;
 
     setDrawProgram(m_shaderProgram ? m_shaderProgram : g_shaders.getDrawTexturedProgram().get());
diff --git a/src/framework/graphics/texture.cpp b/src/framework/graphics/texture.cpp
index 0e538189..4ac366ad 100644
--- a/src/framework/graphics/texture.cpp
+++ b/src/framework/graphics/texture.cpp
@@ -179,10 +179,12 @@ void Texture::generateSoftwareMipmaps(std::vector<uint8> inPixels)
 
     Size inSize = getSize();
     Size outSize = inSize / 2;
-    std::vector<uint8> outPixels(outSize.area()*4);
+    std::vector<uint8> outPixels;
 
     int mipmap = 1;
     while(true) {
+        outPixels.resize(outSize.area()*4);
+
         // this is a simple bilinear filtering algorithm, it combines every 4 pixels in one pixel
         for(int x=0;x<outSize.width();++x) {
             for(int y=0;y<outSize.height();++y) {
diff --git a/src/framework/graphics/texturemanager.cpp b/src/framework/graphics/texturemanager.cpp
index 3eaf8480..4f624cc1 100644
--- a/src/framework/graphics/texturemanager.cpp
+++ b/src/framework/graphics/texturemanager.cpp
@@ -60,7 +60,9 @@ TexturePtr TextureManager::getTexture(const std::string& fileName)
             logError("unable to load texture '", fileName, "': ", e.what());
             texture = g_graphics.getEmptyTexture();
         }
-        m_textures[filePath] = texture;
+
+        if(texture)
+            m_textures[filePath] = texture;
     }
 
     return texture;
diff --git a/src/framework/sound/soundfile.cpp b/src/framework/sound/soundfile.cpp
index 36aab82b..509c761e 100644
--- a/src/framework/sound/soundfile.cpp
+++ b/src/framework/sound/soundfile.cpp
@@ -37,6 +37,9 @@ SoundFilePtr SoundFile::loadSoundFile(const std::string& filename)
         return nullptr;
     }
 
+    // cache file buffer to avoid lags from hard drive
+    file->cache();
+
     char magic[4];
     file->read(magic, 4);
     file->seek(0);
diff --git a/src/otclient/core/spritemanager.cpp b/src/otclient/core/spritemanager.cpp
index c0411ad7..d5bd48c3 100644
--- a/src/otclient/core/spritemanager.cpp
+++ b/src/otclient/core/spritemanager.cpp
@@ -41,6 +41,9 @@ bool SpriteManager::load(const std::string& file)
         if(!m_spritesFile)
             return false;
 
+        // cache file buffer to avoid lags from hard drive
+        m_spritesFile->cache();
+
         m_signature = m_spritesFile->getU32();
         m_spritesCount = m_spritesFile->getU16();
         m_sprites.resize(m_spritesCount);