How to render in and out in timeline? Render vs Export

Dear community,
On another App, 'render' is different with 'export'. But in Resolve, 'render' is an export to final video.
Let's say i have a complicated timeline with so many effect and transition like below. Of couse the playback will be laggy and choppy. So i should render this clip + effect + transition based on in and out marker to make playback normal.
How to do that?
On another App, 'render' is different with 'export'. But in Resolve, 'render' is an export to final video.
Let's say i have a complicated timeline with so many effect and transition like below. Of couse the playback will be laggy and choppy. So i should render this clip + effect + transition based on in and out marker to make playback normal.
How to do that?