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Don’t know if this help:
Adding ProxyExtraOptions “pack=16m-png”
The red fonts always stay blurry as the attached picture shown as if the anti-aliasing was on while the white fonts is in pixel-perfect shape. Is this actually a bug on the server side? Because base on my understanding, the above option turned off sub-pixel sampling and should always provide perfect pixel font. Why it behaves just the opposite always stay blurry?
After changing the quality to maximum and disable multi-pass display encoding, looks like the blurry is improved and the color changes also recovered faster. The only artifact left is that the intermittent color change on red text is still quite big and annoying. I’m using a 43″ 4k monitor, so Xterm default font size is just what I prefer on that size monitor.
Did more test, switch to gnome does not help, but set the terminal font bigger helps a lot. Although font color still changes if the cursor moving around it, the blurry almost unnoticeable. The most annoying scenario is xterm, default fonts, black background and gray foreground. Under sharp small xterm fonts, when the block cursor moving around magenta text in a Vim windows, the blurry is quite bad.
Another test proves that the blurry is not limited to terminal window. In a code analysis tool, the source code has similar syntax highlight as Vim, blurry happens when scrolling up or down. The difference is blurry making color of fonts deeper on light-colored background of the code analysis tool while color getting lighter on dark background of Vim. The blurry gradually disappear in about 2 seconds under all cases. Network bandwidth is high because the client and server are under the same LAN.
One more thing to add, the most annoying part is that fonts having red tone such as magenta is affected the most, affect on cyan is much less noticeable. No blurry at all if white on black or black on white.