I got sick of the slow moving windows on my NA Miata. I bought the delrin window bushings from Moss Miata. The original bushings were actually okay on my car, but since I had the car apart anyways I figured I would upgrade to the delrin bushings and grease the slides with Honda Shin Etsu Grease (link below).
The Shin Etsu grease and window rail cleaning has the biggest affect on the window speed. I don't think the bushings are necessary unless yours have completely worn out. This means you can fix your windows for less than $20.
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Shin Etsu Grease (Miata cult following recommendation):
This greatly improved the mobility of my windows. I was actually worried I would burn out my window motors they went so slow (before this fix).
Tools:
-10mm Socket
-Phillips
-T30 Torx
This process should be the same on the following models:
1990 Mazda Miata
1991 Mazda Miata
1992 Mazda Miata
1993 Mazda Miata
1994 Mazda Miata
1995 Mazda Miata
1996 Mazda Miata
1997 Mazda Miata
1999 Mazda Miata
2000 Mazda Miata
2001 Mazda Miata
2002 Mazda Miata
2003 Mazda Miata
2004 Mazda Miata
2005 Mazda Miata
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