diff --git a/src/main.c b/src/main.c
index bea2f84..d5be625 100644
--- a/src/main.c
+++ b/src/main.c
@@ -192,6 +192,7 @@ static bool initialize(void) {
     SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 0);
     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+    SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
 
     if (ctx.debug)
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
diff --git a/src/rendering.c b/src/rendering.c
index 973afa3..ec2fa6b 100644
--- a/src/rendering.c
+++ b/src/rendering.c
@@ -113,6 +113,7 @@ static void render_space(void) {
     glEnable(GL_DEPTH_TEST);
     glDepthMask(GL_TRUE);
     glDepthFunc(GL_LESS);
+    glDepthRange(0, 1);
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glEnable(GL_TEXTURE_2D);
@@ -175,6 +176,7 @@ void render(void) {
 
     /* TODO: only do it when transition between spaces is needed */
     glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+    glFlush();
 
     {
         glMatrixMode(GL_PROJECTION);