### Godot version

8449592d92eaeef990f5502b419d491ee3eeb7a6

### System information

Windows 11

### Issue description

Zooming in the script editor on an empty script freezes the entire editor for a few seconds, but if the file is large then it freezes for 4-5 seconds (which is unacceptable). Looks like a recent regression.

### Steps to reproduce

Just zoom in/out on the large script file.

### Minimal reproduction project

N/A
FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND(!fd);
	MutexLock lock(fd->mutex);
	_font_clear_cache(fd);
	fd->data.resize(0);
	fd->data_ptr = p_data_ptr;
	fd->data_size = p_data_size;
}
void TextServerFallback::_font_set_style(const RID &p_font_rid, BitField<FontStyle> p_style) {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND(!fd);
	MutexLock lock(fd->mutex);
	Vector2i size = _get_size(fd, 16);
	ERR_FAIL_COND(!_ensure_cache_for_size(fd, size));
	fd->style_flags = p_style;
}
void TextServerFallback::_font_set_face_index(const RID &p_font_rid, int64_t p_face_index) {
	ERR_FAIL_COND(p_face_index < 0);
	ERR_FAIL_COND(p_face_index >= 0x7FFF);
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND(!fd);
	MutexLock lock(fd->mutex);
	if (fd->face_index != p_face_index) {
		fd->face_index = p_face_index;
		_font_clear_cache(fd);
	}
}
int64_t TextServerFallback::_font_get_face_index(const RID &p_font_rid) const {