Vector font with ugly result on SSD1306

Hello,

I come here to find an answer to a problem I meet with the "Vector" font on my screen SSD1306.

Is it a normal result, or is there a problem somewhere?

Here is the result I get:

• I admit that it remains legible but the result is still very ugly in the irregular contours of the characters.
  
  

If this is totally normal and that it is the same resource you get, would you please a solution with another type of fonts that would have a better result and similar size.

I have already traveled the wiki and the Espruino doc, so please, the answers with only the link to the page of the available fonts is not necessary.

Also, do you know if there is a way to use a font already included in an Arduino library, such as:

• https://github.com/iliapenev/ssd1306_i2c
• https://github.com/ThingPulse/esp8266-oled-ssd1306

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