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I'm using QGIS to build complex maps from OSM-Data (GPKG or PostGIS). I'm wondering, how I should upgrade my system, to speed up rendering in canvas:

Intel I5 4x3,2GHz, 16GB DDR3, SSD

Or what about using RAM-Disk or RAID?

In the GIF-Animation you can see real time rendering at changing scale: https://media.giphy.com/media/MUlt8lb1iuzm80alyE/giphy.gif 2 or more seconds for every canvas move or scale are just too much for a smooth work.

I already use parallel rendering for all CPU and simplification: enter image description here

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Probably a bit off topic but, before investing in to hardware I suggest you first look into Postgres/PostGIS tunning. Some starting points:

Tuning PostGIS for production environments?

Performance Tuning PostgreSQL

Tuning Your PostgreSQL Server

PostGIS preformance tips

Tunning PostgreSQL on your Dedicated Server

From my experience you can greatly improve rendering preformance by increasing simplification treshold:

enter image description here

Its not clear data structure of your maps, I presume you have several layers for roads, contours, coverage etc... Reducing tables might help as well since "Overall storage is practically always (substantially) cheaper with a single table instead of multiple tables in 1:1 relationship." (@Erwin Brandstetter). You could achiev this by creating views for layers with same geometry.

If none of this helps enough start thinking of hardware.

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